Years in outboards I have ...the additional suggestion to run the engine dry after a flush, by fuel line disconnect, after a passage, and engine FW flush, then to drain carb fuel bowl when you leave engine for 1, 2 , 3 weeks is good practice, and is worth all the effort taken and ensures your engine is always ready for the next voyage. Best practice.
Good afternoon All, I have the same issue, boat idles fine. In FULL throttle she goes slow. There's a sweet spot on my Throttle but dosnt go any faster than 1100-1300 rpms. Engine has good compression on all cylinders. Reading about 140 for each. The first thing I changed was the Prop. It was the one with the rubber on both ends so I bought a nice one thats solid metal. Also changed the gear fluid while I was at it..... I changed so many things on this 1979 Evinrude 85hp engine. Started with the spark plugs, boots and wires, coils, battery packs on both sides, solenoid for the starter, the starter, primer pump and all full lines including adding a new filter. I also rebuilt the carbs and had them cleaned in some hydroelectric cleaner that really shocks the life out of you cause i touched the water.... started using high quality gas and i've added SeaFoam to the tank to better the fuel. Still do not know what the heck is going on?!?!?! Thanks for this video, we all have a common ground! -Nic
wish you would do a video on 4 stroke outboards making oil. I have a 2013 Yamaha F70 that I purchased new. Broke it in just like the manual said. Never had a problem for the first three seasons. Then last year after winter I hooked the hose to it and started, let it run for about fifteen minutes. I turned off and when I pulled the dipstick the oil was all the way up the dipstick. I drained the oil into a bucket and the changed the filter and put new oil in it. The used oil smelled like gas was in it. This engine has about a 100hrs on it and it doesn't stay in the water. Found out from the mechanic at the dealer they had the same problem on their rental pontoon boats because people just put and never run them hard. Now I run it at higher RPM's for the first 15-30 minutes and it does seem to take care of it. This is not just a Yamaha issue but happens to many manufacturers. Any thoughts?
Ventures With Joe that's extremely exaggerated lol. I'd say you only have to worry about it if you know you aren't going to run it for 30+ days, then you should drain carb of fuel.
I'll leave mine for over 2 months at some point of time and it runs perfect every time I get on it. And I never let mine run out of gas.its a 99 and runs like a champ
It's not a good idea to run your carbs dry as it will dry out any seals and gaskets. If you properly service the fuel systems you don't need to do this. First fill the tank this will eliminate condensation. Next you need marine fuel stabilizer. Run engine with muffs for 5 to 10 min. The fuel system has now been winterized. Change lower unit. Grease fittings remove battery and your done. battery
I took your advice. Guess what, when i took my carburetor apart the bottom needle was suck and the screw that holds the float on was ate up from the fuel. thanks. well, It wasn't you who told me to do this. But many years ago that was the best way to do it. Until ethanol came along.
Ken Taylor That's the way I do it. Long life fuel additive.Full tank. (Non ethanol) Run motor. Store boat. Batteries on smart charger. When I'm back 12months later. Drain ALL fuel from tank. Clean filters(motor plus fuel water filter) refill... Lower leg check. Etc .. Starts first time everytime. Yamaha 75HP 1995 motor.
i have an older mercury outboard 50 hp. runs great but water only trickles out and when i open it up on the water has no power. bogs out. all feed back is appreciated
The biggest issue with all water craft engines is the use of "fuel stabilizer" IT'S GARBAGE! Don't be lazy thinking that fuel will be ok after several months of sitting. Just remove the fuel at the end of season. Simple. You pay thousands of dollars for that Engine and yet cheap out on taking care of it. This goes for any fuel that will be sitting for more than 2 weeks.
I run premium 91 octane non ethanol gas in my engines. Can I leave my 2 stroke mercury 25 hp wet all the time? i treat the gas at every fill up and run the motor once a week until it is fully warmed up during the winter, in the summer i get usually get out twice a week?
I have a 2006 mercury outboard 4 cycle fuel injection , Problem is it runs only tachs out to 3000 does not plane boat properly , It should tach out to 5500 to 6000 motor sounds good no miss fires very smooth operation , Any suggestion what to look for?
This video was really helpful as a first time boater, thank you very much. I've been getting all kinds of answers between disconnecting the fuel line to stop the motor after use and just leaving the gasoline in the motor. I don't get out to the lake or river every week. More like once a month. But what would disconnecting the fuel line be bad if I actually used it more often?
I have a 1990 Johnson 200hp 2 stroke and it just got a tune up. new plugs, new fuel lines and bulb, new impeller, fuel pump was good, carbs are good, spark and compressions all good. I had a problem with it the other day after the tune up was done, it would not go faster than 10mph. Called the shop they said I needed to let the engine warm up longer than what I did. They also said check the fuel and the prop does that sound about right? Also would you happen to know what the stock prop size for a that motor would be?
+onelik We need to start out by noting that it's nearly impossible to diagnose an engine from afar, but that said, insufficient warm-up most certainly does not sound like your issue. The prop would be suspect if the engine was turning the recommended WOT rpm, which in your case should be in the 5000 or 5500 rpm range. Otherwise, the fuel system is a possibility. As far as a "stock" prop goes, there's no simple answer. The correct prop depends on the amount of weight and type of hull it's pushing. Fortunately, most suppliers will let you try a prop or three and swap them until you find the right one. For more info on choosing the correct propeller, read our Understanding Propeller Pitch article www.boats.com/how-to/understanding-propeller-pitch/ which has our How to Find Out if You Have the Right Pitch Propeller video embedded. Good luck!
I would think it would be best to run the fuel out of the carburetors. Then there is nothing to eat at the metal in them. The top carb always has no fuel in them when you tilt them up. it drains out somehow. every time i have cleaned are rebuilt them they have no fuel in them. and the gaskets are fin in them too.
Dean I purchase a two stroke engine boat and the former owner told me to spray a carburetor cleaner before I start the engine I did and start but them the engine stop in the middle of the lake, I manage to start again but is not reliable, any suggestions Thanks.
Yes correct for carbureted 2 cycle outboards, the service manual I have says at the end of the season, to cut off the fuel then run at idle till the engine starts to sputter then shut it off. This way as soon as the lowest carburetor starts to run out of gas, the engine is off so there is still oil coating those cylinders but some of the gas has been used up so less to dry up and leave behind problem causing gunk.
any time you are having erract. run problems one simple check my fix it the tiny little oring in fuel connector can develope a hole from use and age pull old oring out by hooking it with a fish hook replace oring with a new one all boat shops carry them there is one in each end of fuel line should keep some on hand. these cause idle ok but when you rev up theoring is sucking air not gas ----about 50cts repair
Running a 2-stroke motor out of gas? No way. Not doing that to mine. The oil/gas mixture is what lubricates the engine. Running it out (running lean) is running w/out lube. Plus there will always be some left in the bowl. I run ethanol free non-oxygenated fuel with SeaFoam. She's sat for a year like that with no issues.
I have a 2003 Merc 115 four stroke fuel injected motor that will idle fine but will not rev up just dies. Fuel pressure 140-143. Will rev up if I squeeze the fuel return line from the fuel press regulator. the fuel pressure then goes to 160. Any ideas what to do.
Hey Sam - there are a few possibilities, but most commonly if the boat ran okay and then this starts happening out of the blue, your prop is spinning out on the hub. The first thing I'd try doing is putting on a different prop. If it operates properly, then you need to have the old prop re-hubbed. If not, you'll have to head for the mechanic.
Ok...just bought my first motorized boat...a little 14 foot john boat with a Johnson 30 hp. It is running great and I want to keep it that way. I have been reading comments and guess I need to get stabilizer and sea foam...I run 91 octane and 50:1 mix....anything else I need to know? Thanks in advance from a rookie who doesnt like to make mistakes. Almost forgot the plug yesterday but caught it before I got off the trailer.
Hi I have a 4 stroke parson 15 that wont fire, fuel is clean and is coming through, have cleaned and checked the space on the plugs, neither plug appears to be sparking, any advice
Colin Elwick this is one of those problems you simply can't diagnose from afar. Our best advice: bite the bullet and take the engine to a certified marine mechanic.
My neighbor just purchased a 5 HP Mercury outboard motor from a friend. When he was topping off the oil injection tank he accidently poured in gas treatment instead of oil but discovered his mistake BEFORE running the engine. What is the recommended method to flush out the tank?
Tohatsu 50 hp not enough fuel supply by primer, fuel not supply in injector, engine is not started, A. B. C flash lights is flashing, plz share any this types of truble shooting vedios or suggestion.
my motor goes good for 20 minutes then the primer is flat, after keep squeezing the primer for 5 minutes then the motor starts but only runs max 5 knots all the way back to the boat ramp if i try go faster it stalls, any ideas because it does go fast for the first 20 minutes every time I go out then primer flat again? I dont think its a blockage as it runs perfect for first 20 min each time. Please help...
I have a Johnson 150 2 stroke 1994 it seems on hot days she doesn't want to idle correctly to get the necessary RPMs to get me to plane is this a carburetor issue or water pump?
I use to do that on my first engine an 5 hp briggstraton, now I have a 1996 Yamaha 115 two strokes, should I run it until cut off disconnecting the fuel line too?? considering the mix of fuel and oil also lubricate the engine.
Yes Hugo, you're fine - remember, as long as the engine is firing there's fuel, and as long as there's fuel there's lubricant, so there's no danger in running it out of fuel.
ive got a 25hp mercury (1980s era) it has been siting for two years without running but after some work i got it running but when i turn the choke off it dies. i have to start it at full choke and turn it back a quarter of the way and itll run for a little bit and then it starts to die unless i put it back to full choke. i try going back and forth with it for a little while then try turning the choke off and it kills almost right away. i put clean gas in it and tried running seafoam through it which didnt seem to help much either. any suggestions on what i can try to do to get it running properly?
Hi sam garr. Sounds like it's time for a full-blown carb rebuild; just running Sea Foam or cleaner through won't do the trick. Be sure to completely submerge the carburetor in a bucket of cleaner, when you do the job. Let us know if that works.
How do you flush an outboard motor that is mounted on a sailboat that sits on a saltwater mooring for 6 months at a time. My best idea at the moment is to flush it from a 5 gallon jug of onboard fresh water after each weekly sail? That seems like a hell of a lot of work.
Got a 2010 70 Yamaha 4 stroke. Engine is hard to start, but once started runs fine for about an hour or so. Then it acts like its starved for fuel--as if you had disconnected the fuel line. I can pump the gas line bulb a few times and motor runs ok for a time--then process repeats itself many times. I assume its a bad fuel pump? Not sure as there are a lot of sensors on these new motors. Any ideas?
Hi Jeff P. That's a tough call. We went to Norfolk Marine Company's Yamaha Master Tech, Chris Breeden for his advice: It does sound like the fuel pump could be going bad. Two other possibilities are the primer bulb, or even the anti-siphon valve on your fuel tank. Hope this helps!
Jeff P Hi I have a 70 Yamaha four stroke having a similar problem that you had hopefully you found the answer What was the solution to your problem thank you Ed . ekoicim@gmail.com
150 Johnson, runs fine for about 1 hr, when throttle back from full speed, it dies, takes a while to start, then idles high 4500 rpm, then will slowly drop to 1200rpm, symptoms repeat.. Any idea? I'm thinking carb floats?
i have a 1985 yamaha 50hp ETLJ 4 stroke ....i can run it max or even half speed for over 2 hours with no issues.water comes out and always have green oil light on...but when trolling for 20 min or more the alarm will sound in the throttle control box ..i have to turn it off for aprox 10 min then i can go again for a bit.why is it over heating i have a steady flow of water pissing out the back of the motor ..green light all times.i am running yamalube 1 which is what they recommend in the manual.intake vents are clear nothing blocking water flow.sometimes i can troll for over 5 hours with no problems other times 20-45 min and alarm sounds,and exhaust is coming out fine,.please help and ty in advance
Hey Tanker - ouch, this is a toughie, and we simply can't diagnose this one from afar. Best we can do is recommend taking the engine in to a certified Yamaha tech - sorry!
Hey Brutal Bear (nice pic!) As far as the fuel system goes that's correct, just as long as your fuel doesn't sit for more than a couple of weeks. (If it does, you may still have issues). But when it comes to flushing you still need to be 100-percent sure to flush on a regular basis.
Doesn't running the engine out of fuel cause an excessively lean condition that is harmful to the engine? I've stored my engine using fuel saver for up to 6 months without any problems.
samiam1150 No, it doesn't harm the engine one bit. Remember, these are carbureted two-strokes we're talking about, not complex EFI engines. All the marine mechanics we've known through the years give the exact same advice.
***** Two strokes are lubricated by the oil that is mixed with the fuel. An excessively lean fuel mixture can and does harm 2 stroke engines. When I bent wrenches on marine engines we drained the float bowls. We didn't run them dry.
Hey, we love your videos! We would love to send you out some of our water based rust remover Metal Rescue Rust Remover Bath for you to try out on some of your rusty parts! We would love to get you input it and are positive you will love it! What do you say?
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Could not get fuel to my merc 225 outboard. Changed bulb - fuel line looks OK Brown fluid (thin) coming out vent port on side of boat. Year 2000 boat and motor for saltwater. It has been in storage for a few months and just added 50 gallons gas with ethanol. Volume of gas when stored less than 20 gallons.
i have a 35 johnson 1999 3 cylinder it will run for about three bends in the river,then get hot,has a stream coming from water pump,changed the temp. sensor no help,now since it has set for awhile,go to crank it and as long as you dont pump the to BUBBLE TO TIGHT tight it will start and run for about 20 seconds and goes dead,think i'm going to replace the water pump anyway it's been several years since i have changed it,as far as the running dont know thought maybe fuel pump or carbs. need cleaning,open for suggestions.THANKS!!! IVAN BURKETT
07 yamaha vmax 150 carb engine extremely hard to start cold..once it starts the first time then it starts really easy the rest of the day 2 Days Later again super hard to start takes forever put boat in winter storage 4 months' the fuel stabilizer in the tank now it won't start at all won't even hit just crank anybody have any suggestions would be greatly appreciated
I have a 70hp yamaha 4 cycle on a pontoon boat my wife has had since long before we got together. i put new tanks on it ran it with water before taking it out on the lake and it ran fine. Didn't get 200 yards and it quit. Put a new primer bulb and fuel filter in it and it still won't run. It fires and dies. Anybody got any ideas I'm thinking fuel pump but I really don't know this motor.
I've got a 70 Marc cream clean carburetors butter Stratus on clean fuel just won't lines and it starts in ribs up but you get it out in the lakeand you can put it in gear and just verlydoes RunI had it worked out 3 times and I just want know what I cjust wont take gashard to start put a fuel pump on it clean carbs
Might try and check your spark plug wires and make sure they have no cracks or anything like they. They could be grounding to the engine block if that is the case.
Also may try checking your fuel lines, gas filter, make sure there are no obstructions in the lines. Check for cracking in the lines, leaks at connections, Gas tank's vent is open, if all that checks out move on to next step. You want your fuel system to be air tight so that the carburetors can pull the fuel from the take. Next thing that I would do is carburetor rebuild. Buy some carburetor cleaner at any auto parts place and follow a diagram I use boats.net for all of mine. If you are unsure how to do them take it in to get them cleaned, get your timing checked while your boat is there. They will be able to find the problem.
It means you need to flush it with fresh water. There are two ways to do this after bringing the motor onshore: a) stick the shaft down into a huge bucket of fresh water (ensure the cooling water intake is submerged) and let the motor run for a few minutes, or b) connect a fresh water hose to the cooling water intake (requires a special part to make the connection), turn on the fresh water and then run the motor.
Hi Elton Williams, you can drain the lines and filter, but a bit of fuel is bound to remain. As far as fuel type goes, Evinrude recommends any gasoline with an octane rating of 87 or higher and no more than 10% ethanol.
Hi rob. In my Honda 2.5 and my Mercury 9.9 I strictly run premium 91 octane which is non ethanol. I never use any fuel additives because gas companies already add there own. I only add fuel stabilizer to the tank. Hope that helps...🎣🚤
Please help. I have a 15hp evinrude 4 stroke. I starts easy, pumps lots of water. But when it gets hot it cuts out. Starts again then goes pop pop and dies. Whats you verdict?
I lost power in my 115 hp Yamaha after not using it in a pretty long period. It was of course bad gas although the tech said the gas was okay after doing a visual test. Took to the shop they had to have the injectors cleaned. Got it back did not use it that much but did run the boat every month for 15 minutes. Problem returned. Took it back ended up doing the same job over. This time I made them drain the tank. To insure this would not happen again I used non-ethanol gas. Ran well for a few months but is now starting to break down when I try to get 5,000 rpm. Took the boat on fresh water ran it at 3,000 rpm gradually moving it up to 4,800. Ran fine and ran it a long time. I finally tried 5,000 rpm and it starting losing power again. The gas in it now is fresh clean gas.
Hey Carmine Petrangelo, sorry you're having so many issues, but the news I have isn't good; it sounds like a new problem, unrelated to your fuel issues. There are a number of potential reasons the outboard could be acting like this, and it isn't something that can be diagnosed from afar. I'm afraid you need to get that engine back into the hands of a good tech.
***** What would be some of the different possibilities? Knowing that at least gives me some possibilities to look into. I have already have had it worked on twice. I also could use a good contact number for Yamaha.
Carmine Petrangelo It could be as simple as a clogged filter or a cracked hose, or as complex as an ECU issue. Your best bet is to go to the Yamaha Dealer Service Locator at yamahaoutboards.com/dealer-locator, plug in your zip code, and see who is near-by.
Ridiculous '' advice '' . Draining is not necessary as long as you use only ethanol free gas... and the stabilizer's only purpose is to hold the octane level up which will work up to 2 yrs.
Years in outboards I have ...the additional suggestion to run the engine dry after a flush, by fuel line disconnect, after a passage, and engine FW flush, then to drain carb fuel bowl when you leave engine for 1, 2 , 3 weeks is good practice, and is worth all the effort taken and ensures your engine is always ready for the next voyage. Best practice.
Good afternoon All,
I have the same issue, boat idles fine. In FULL throttle she goes slow. There's a sweet spot on my Throttle but dosnt go any faster than 1100-1300 rpms.
Engine has good compression on all cylinders. Reading about 140 for each.
The first thing I changed was the Prop. It was the one with the rubber on both ends so I bought a nice one thats solid metal. Also changed the gear fluid while I was at it.....
I changed so many things on this 1979 Evinrude 85hp engine. Started with the spark plugs, boots and wires, coils, battery packs on both sides, solenoid for the starter, the starter, primer pump and all full lines including adding a new filter.
I also rebuilt the carbs and had them cleaned in some hydroelectric cleaner that really shocks the life out of you cause i touched the water....
started using high quality gas and i've added SeaFoam to the tank to better the fuel. Still do not know what the heck is going on?!?!?!
Thanks for this video, we all have a common ground!
-Nic
Fuel pump fixed mine.
wish you would do a video on 4 stroke outboards making oil. I have a 2013 Yamaha F70 that I purchased new. Broke it in just like the manual said. Never had a problem for the first three seasons. Then last year after winter I hooked the hose to it and started, let it run for about fifteen minutes. I turned off and when I pulled the dipstick the oil was all the way up the dipstick. I drained the oil into a bucket and the changed the filter and put new oil in it. The used oil smelled like gas was in it. This engine has about a 100hrs on it and it doesn't stay in the water. Found out from the mechanic at the dealer they had the same problem on their rental pontoon boats because people just put and never run them hard. Now I run it at higher RPM's for the first 15-30 minutes and it does seem to take care of it. This is not just a Yamaha issue but happens to many manufacturers. Any thoughts?
Whats a good high quality stabilizer and how you flush engine
If you aren't running every other day or every three days??? That's a little exaggerated.
Ventures With Joe that's extremely exaggerated lol. I'd say you only have to worry about it if you know you aren't going to run it for 30+ days, then you should drain carb of fuel.
I'll leave mine for over 2 months at some point of time and it runs perfect every time I get on it. And I never let mine run out of gas.its a 99 and runs like a champ
Sys falut Merkur optimax show
Outboards are just straight out crap undo the engine mounts and let her fall in the water get rid of her
With the F8 is it still okay to run the outboard out of fuel while using the cold flush built in hose?
Thank you very much for the valuable information greetings to all of you
Thanks for sharing this information.
It's not a good idea to run your carbs dry as it will dry out any seals and gaskets. If you properly service the fuel systems you don't need to do this. First fill the tank this will eliminate condensation. Next you need marine fuel stabilizer. Run engine with muffs for 5 to 10 min. The fuel system has now been winterized. Change lower unit. Grease fittings remove battery and your done.
battery
I took your advice. Guess what, when i took my carburetor apart the bottom needle was suck and the screw that holds the float on was ate up from the fuel. thanks. well, It wasn't you who told me to do this. But many years ago that was the best way to do it. Until ethanol came along.
Ken Taylor
That's the way I do it. Long life fuel additive.Full tank. (Non ethanol) Run motor. Store boat. Batteries on smart charger.
When I'm back 12months later. Drain ALL fuel from tank. Clean filters(motor plus fuel water filter) refill... Lower leg check. Etc
.. Starts first time everytime. Yamaha 75HP 1995 motor.
How do you flush your motor? Mine doesn't fit in the crapper.
i have an older mercury outboard 50 hp. runs great but water only trickles out and when i open it up on the water has no power. bogs out. all feed back is appreciated
The biggest issue with all water craft engines is the use of "fuel stabilizer" IT'S GARBAGE! Don't be lazy thinking that fuel will be ok after several months of sitting. Just remove the fuel at the end of season. Simple. You pay thousands of dollars for that Engine and yet cheap out on taking care of it. This goes for any fuel that will be sitting for more than 2 weeks.
I run premium 91 octane non ethanol gas in my engines. Can I leave my 2 stroke mercury 25 hp wet all the time? i treat the gas at every fill up and run the motor once a week until it is fully warmed up during the winter, in the summer i get usually get out twice a week?
will a contaminated fuel filter on a 4 stroke shut the motor down where it will not crank?
I have a 2006 mercury outboard 4 cycle fuel injection , Problem is it runs only tachs out to 3000 does not plane boat properly , It should tach out to 5500 to 6000 motor sounds good no miss fires very smooth operation , Any suggestion what to look for?
Leave it to Red Gear Marine and Performance to get you back out on the water. #hamptonroads #boatrepair #redgearmarine
i learned from you're video i did this on my Yamaha F225 3.3 liter Outboard Motor and flushing it like you do on a big engine and it runs like new
This video was really helpful as a first time boater, thank you very much. I've been getting all kinds of answers between disconnecting the fuel line to stop the motor after use and just leaving the gasoline in the motor. I don't get out to the lake or river every week. More like once a month. But what would disconnecting the fuel line be bad if I actually used it more often?
I love folks that live in "La-La" land.
I have a 1990 Johnson 200hp 2 stroke and it just got a tune up. new plugs, new fuel lines and bulb, new impeller, fuel pump was good, carbs are good, spark and compressions all good. I had a problem with it the other day after the tune up was done, it would not go faster than 10mph. Called the shop they said I needed to let the engine warm up longer than what I did. They also said check the fuel and the prop does that sound about right? Also would you happen to know what the stock prop size for a that motor would be?
+onelik We need to start out by noting that it's nearly impossible to diagnose an engine from afar, but that said, insufficient warm-up most certainly does not sound like your issue. The prop would be suspect if the engine was turning the recommended WOT rpm, which in your case should be in the 5000 or 5500 rpm range. Otherwise, the fuel system is a possibility. As far as a "stock" prop goes, there's no simple answer. The correct prop depends on the amount of weight and type of hull it's pushing. Fortunately, most suppliers will let you try a prop or three and swap them until you find the right one. For more info on choosing the correct propeller, read our Understanding Propeller Pitch article
www.boats.com/how-to/understanding-propeller-pitch/
which has our How to Find Out if You Have the Right Pitch Propeller video embedded. Good luck!
For a 2 stroke oil injected engine definitely would not recommend running the engine until there is no fuel left....!
I would think it would be best to run the fuel out of the carburetors. Then there is nothing to eat at the metal in them. The top carb always has no fuel in them when you tilt them up. it drains out somehow. every time i have cleaned are rebuilt them they have no fuel in them. and the gaskets are fin in them too.
Dean. I'm with you . when a two stroke is running out of gas it's also running out of oil
Dean I purchase a two stroke engine boat and the former owner told me to spray a carburetor cleaner before I start the engine I did and start but them the engine stop in the middle of the lake, I manage to start again but is not reliable, any suggestions Thanks.
Yes correct for carbureted 2 cycle outboards, the service manual I have says at the end of the season, to cut off the fuel then run at idle till the engine starts to sputter then shut it off. This way as soon as the lowest carburetor starts to run out of gas, the engine is off so there is still oil coating those cylinders but some of the gas has been used up so less to dry up and leave behind problem causing gunk.
any time you are having erract. run problems one simple check my fix it the tiny little oring in fuel connector can develope a hole from use and age pull old oring out by hooking it with a fish hook replace oring with a new one all boat shops carry them there is one in each end of fuel line should keep some on hand. these cause idle ok but when you rev up theoring is sucking air not gas ----about 50cts repair
Punctuation exists for a reason.
Running a 2-stroke motor out of gas? No way. Not doing that to mine. The oil/gas mixture is what lubricates the engine. Running it out (running lean) is running w/out lube. Plus there will always be some left in the bowl.
I run ethanol free non-oxygenated fuel with SeaFoam. She's sat for a year like that with no issues.
Lol, destroy your 2 stroke so you can came buy a new one!!!
I have a 2003 Merc 115 four stroke fuel injected motor that will idle fine but will not rev up just dies. Fuel pressure 140-143. Will rev up if I squeeze the fuel return line from the fuel press regulator. the fuel pressure then goes to 160. Any ideas what to do.
My boat motor revs up too much but it doesn't go fast is there anything you can help thanks
Hey Sam - there are a few possibilities, but most commonly if the boat ran okay and then this starts happening out of the blue, your prop is spinning out on the hub. The first thing I'd try doing is putting on a different prop. If it operates properly, then you need to have the old prop re-hubbed. If not, you'll have to head for the mechanic.
ok thanks for ur help i will try
Ok...just bought my first motorized boat...a little 14 foot john boat with a Johnson 30 hp. It is running great and I want to keep it that way. I have been reading comments and guess I need to get stabilizer and sea foam...I run 91 octane and 50:1 mix....anything else I need to know? Thanks in advance from a rookie who doesnt like to make mistakes. Almost forgot the plug yesterday but caught it before I got off the trailer.
Run non ethanol fuel. 50:1 mix if its available. Where you live. The ethanol is what gums up carbs.
Hi, i have a 1975 85hp 2 stroke evinrude. I use ethanol free fuel. Do i still need to starve the engine and drain the carbs? Thanks
With any carburated outboard it's always best to do so if the engine is expected to sit for a week or more - ethanol, or not.
Do I need to flush out my motor if only ran in fresh water?
Hi
I have a 4 stroke parson 15 that wont fire, fuel is clean and is coming through, have cleaned and checked the space on the plugs, neither plug appears to be sparking, any advice
Colin Elwick this is one of those problems you simply can't diagnose from afar. Our best advice: bite the bullet and take the engine to a certified marine mechanic.
My neighbor just purchased a 5 HP Mercury outboard motor from a friend. When he was topping off the oil injection tank he accidently poured in gas treatment instead of oil but discovered his mistake BEFORE running the engine. What is the recommended method to flush out the tank?
Joe Becker
Tohatsu 50 hp not enough fuel supply by primer, fuel not supply in injector, engine is not started, A. B. C flash lights is flashing, plz share any this types of truble shooting vedios or suggestion.
my motor goes good for 20 minutes then the primer is flat, after keep squeezing the primer for 5 minutes then the motor starts but only runs max 5 knots all the way back to the boat ramp if i try go faster it stalls, any ideas because it does go fast for the first 20 minutes every time I go out then primer flat again? I dont think its a blockage as it runs perfect for first 20 min each time. Please help...
It sounds like you need to open the small air intake valve on top of your fuel filler cap as you are most likely getting a vacume in the fuel tank.
@@wedgwood8 Hi, I found out its dirt in the fuel tank and blocking at the primer but thanks for your help, much appreciated😊👍
Will a pinhole in my plastic gas tank keep my outboard motor from running
I was flushing my motor with the ear muffs after an hour of running on the water but then it kept stalling and won’t start!
I have 2stroke Mercury 150 black max engine with low rpm. I does not run full capacity when in water? Can anyone help?
I have a Johnson 150 2 stroke 1994 it seems on hot days she doesn't want to idle correctly to get the necessary RPMs to get me to plane is this a carburetor issue or water pump?
Definitely not the water pump
I use to do that on my first engine an 5 hp briggstraton, now I have a 1996 Yamaha 115 two strokes, should I run it until cut off disconnecting the fuel line too?? considering the mix of fuel and oil also lubricate the engine.
Yes Hugo, you're fine - remember, as long as the engine is firing there's fuel, and as long as there's fuel there's lubricant, so there's no danger in running it out of fuel.
Thanks a lot
Have an additional question, should I write here or at separate email
I have a 70hp evenrude outboard 2 stroke. At idle starts and runs fine but under load goes in and out of power. Any suggestions would help
That's your carb buddy.
@@nonya8694 your dead on bro
Or run non ethanol fuel and a lot of your issues will be resolved.
If it were only that easy. There is NO non-ethanol fuel available in my town. Maybe a handful of pumps in the entire state.
ive got a 25hp mercury (1980s era) it has been siting for two years without running but after some work i got it running but when i turn the choke off it dies. i have to start it at full choke and turn it back a quarter of the way and itll run for a little bit and then it starts to die unless i put it back to full choke. i try going back and forth with it for a little while then try turning the choke off and it kills almost right away. i put clean gas in it and tried running seafoam through it which didnt seem to help much either. any suggestions on what i can try to do to get it running properly?
Hi sam garr. Sounds like it's time for a full-blown carb rebuild; just running Sea Foam or cleaner through won't do the trick. Be sure to completely submerge the carburetor in a bucket of cleaner, when you do the job. Let us know if that works.
How do you flush an outboard motor that is mounted on a sailboat that sits on a saltwater mooring for 6 months at a time. My best idea at the moment is to flush it from a 5 gallon jug of onboard fresh water after each weekly sail? That seems like a hell of a lot of work.
There's no easy answer since it depends on how and where the engine is mounted and whether or not it has a flushing port.
Got a 2010 70 Yamaha 4 stroke. Engine is hard to start, but once started runs fine for about an hour or so. Then it acts like its starved for fuel--as if you had disconnected the fuel line. I can pump the gas line bulb a few times and motor runs ok for a time--then process repeats itself many times. I assume its a bad fuel pump? Not sure as there are a lot of sensors on these new motors. Any ideas?
Hi Jeff P. That's a tough call. We went to Norfolk Marine Company's Yamaha Master Tech, Chris Breeden for his advice:
It does sound like the fuel pump could be going bad. Two other possibilities are the primer bulb, or even the anti-siphon valve on your fuel tank. Hope this helps!
Jeff P Hi I have a 70 Yamaha four stroke having a similar problem that you had hopefully you found the answer What was the solution to your problem thank you Ed . ekoicim@gmail.com
Hey, I have a 1999 Force by Mercury 40hp and my carburetor get cold and sweat. Also some times it leaks gasoline. Any suggestions?
again spot on.
150 Johnson, runs fine for about 1 hr, when throttle back from full speed, it dies, takes a while to start, then idles high 4500 rpm, then will slowly drop to 1200rpm, symptoms repeat.. Any idea? I'm thinking carb floats?
That's a good thought, we'd start with a complete carb rebuild. Let us know how it goes.
i have a 1985 yamaha 50hp ETLJ 4 stroke ....i can run it max or even half speed for over 2 hours with no issues.water comes out and always have green oil light on...but when trolling for 20 min or more the alarm will sound in the throttle control box ..i have to turn it off for aprox 10 min then i can go again for a bit.why is it over heating i have a steady flow of water pissing out the back of the motor ..green light all times.i am running yamalube 1 which is what they recommend in the manual.intake vents are clear nothing blocking water flow.sometimes i can troll for over 5 hours with no problems other times 20-45 min and alarm sounds,and exhaust is coming out fine,.please help and ty in advance
Hey Tanker - ouch, this is a toughie, and we simply can't diagnose this one from afar. Best we can do is recommend taking the engine in to a certified Yamaha tech - sorry!
my 200 Yamaha 2 stroke wont get on top could it b the fuel pump ,it gos then slows down every 5 r 6 seconds?
I have a 96 merc 200 efi it bogs when I first take off,was fine last season ..hope its not the vet or fuel pump assimbly
We hope not, too!
If I'm running ethanol free gas, I don't need to worry about this issues so much correct?
Hey Brutal Bear (nice pic!) As far as the fuel system goes that's correct, just as long as your fuel doesn't sit for more than a couple of weeks. (If it does, you may still have issues). But when it comes to flushing you still need to be 100-percent sure to flush on a regular basis.
Ok, thanks for answering.
william avery nnhn
Doesn't running the engine out of fuel cause an excessively lean condition that is harmful to the engine? I've stored my engine using fuel saver for up to 6 months without any problems.
samiam1150 No, it doesn't harm the engine one bit. Remember, these are carbureted two-strokes we're talking about, not complex EFI engines. All the marine mechanics we've known through the years give the exact same advice.
***** Two strokes are lubricated by the oil that is mixed with the fuel. An excessively lean fuel mixture can and does harm 2 stroke engines. When I bent wrenches on marine engines we drained the float bowls. We didn't run them dry.
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can I ask you a question about a 99 mercury 50 hp bigfoot ?
No
Could not get fuel to my merc 225 outboard. Changed bulb - fuel line looks OK Brown fluid (thin) coming out vent port on side of boat. Year 2000 boat and motor for saltwater. It has been in storage for a few months and just added 50 gallons gas with ethanol. Volume of gas when stored less than 20 gallons.
Hey WarThunder Bros., have you made sure the vent isn't clogged? When an operative fuel line won't supply any fuel, that's often the case.
i have a 35 johnson 1999 3 cylinder it will run for about three bends in the river,then get hot,has a stream coming from water pump,changed the temp. sensor no help,now since it has set for awhile,go to crank it and as long as you dont pump the to BUBBLE TO TIGHT tight it will start and run for about 20 seconds and goes dead,think i'm going to replace the water pump anyway it's been several years since i have changed it,as far as the running dont know thought maybe fuel pump or carbs. need cleaning,open for suggestions.THANKS!!! IVAN BURKETT
If it has one, then the thermostat may be stuck closed. It's fairly easy to check.
muy bueno. me gustaría aprende la mecánica. de estos. motores.
pero. en español
SICKNESS
omg sick af
Octa zWpt
07 yamaha vmax 150 carb engine extremely hard to start cold..once it starts the first time then it starts really easy the rest of the day 2 Days Later again super hard to start takes forever put boat in winter storage 4 months' the fuel stabilizer in the tank now it won't start at all won't even hit just crank anybody have any suggestions would be greatly appreciated
I have a 70hp yamaha 4 cycle on a pontoon boat my wife has had since long before we got together. i put new tanks on it ran it with water before taking it out on the lake and it ran fine. Didn't get 200 yards and it quit. Put a new primer bulb and fuel filter in it and it still won't run. It fires and dies. Anybody got any ideas I'm thinking fuel pump but I really don't know this motor.
I've got a 70 Marc cream clean carburetors butter Stratus on clean fuel just won't lines and it starts in ribs up but you get it out in the lakeand you can put it in gear and just verlydoes RunI had it worked out 3 times and I just want know what I cjust wont take gashard to start put a fuel pump on it clean carbs
My 90 hp Yam starts and runs fine, but when you put it under load it bogs down
Might try and check your spark plug wires and make sure they have no cracks or anything like they. They could be grounding to the engine block if that is the case.
Yamaha boat having a hard time to turn on
Also may try checking your fuel lines, gas filter, make sure there are no obstructions in the lines. Check for cracking in the lines, leaks at connections, Gas tank's vent is open, if all that checks out move on to next step. You want your fuel system to be air tight so that the carburetors can pull the fuel from the take. Next thing that I would do is carburetor rebuild. Buy some carburetor cleaner at any auto parts place and follow a diagram I use boats.net for all of mine. If you are unsure how to do them take it in to get them cleaned, get your timing checked while your boat is there. They will be able to find the problem.
After running my outboard motor completely out of gas it will not stay idled
What does flush your motor mean????
It means you need to flush it with fresh water. There are two ways to do this after bringing the motor onshore: a) stick the shaft down into a huge bucket of fresh water (ensure the cooling water intake is submerged) and let the motor run for a few minutes, or b) connect a fresh water hose to the cooling water intake (requires a special part to make the connection), turn on the fresh water and then run the motor.
3.5 suzuki motor clean fuel plenty of spark but does not start
Is it possible to drain fuel on a 50 hp evinrude etec? What kindof fuel is best to use for it also, unleaded gas?
Hi Elton Williams, you can drain the lines and filter, but a bit of fuel is bound to remain. As far as fuel type goes, Evinrude recommends any gasoline with an octane rating of 87 or higher and no more than 10% ethanol.
Awesome thank u.
Elton Williams You're welcome.
I run non ethanol. Its worth it.
Can you use yamaha fuel additives like Ring free and fuel stabilizee? still with non Ethan?
Hi rob. In my Honda 2.5 and my Mercury 9.9 I strictly run premium 91 octane which is non ethanol. I never use any fuel additives because gas companies already add there own. I only add fuel stabilizer to the tank. Hope that helps...🎣🚤
Do you guys need an assistant?
No power to starter
Please help. I have a 15hp evinrude 4 stroke. I starts easy, pumps lots of water. But when it gets hot it cuts out. Starts again then goes pop pop and dies. Whats you verdict?
Sorry William, a problem like that can't be accurately diagnosed from afar. Your best move is to take it to a pro.
boats.com terms staff
when starting the motor an alarm sounds
Vst
HONDA 115 HP OUTBOARD WILL NOT GO PAST A CERTAIN SPEED
My dads is doing this. Did you resolve it?
I lost power in my 115 hp Yamaha after not using it in a pretty long period. It was of course bad gas although the tech said the gas was okay after doing a visual test. Took to the shop they had to have the injectors cleaned. Got it back did not use it that much but did run the boat every month for 15 minutes. Problem returned. Took it back ended up doing the same job over. This time I made them drain the tank. To insure this would not happen again I used non-ethanol gas. Ran well for a few months but is now starting to break down when I try to get 5,000 rpm. Took the boat on fresh water ran it at 3,000 rpm gradually moving it up to 4,800. Ran fine and ran it a long time. I finally tried 5,000 rpm and it starting losing power again. The gas in it now is fresh clean gas.
Hey Carmine Petrangelo, sorry you're having so many issues, but the news I have isn't good; it sounds like a new problem, unrelated to your fuel issues. There are a number of potential reasons the outboard could be acting like this, and it isn't something that can be diagnosed from afar. I'm afraid you need to get that engine back into the hands of a good tech.
***** What would be some of the different possibilities? Knowing that at least gives me some possibilities to look into. I have already have had it worked on twice. I also could use a good contact number for Yamaha.
Carmine Petrangelo It could be as simple as a clogged filter or a cracked hose, or as complex as an ECU issue. Your best bet is to go to the Yamaha Dealer Service Locator at yamahaoutboards.com/dealer-locator, plug in your zip code, and see who is near-by.
Do that repeatedly with a 2 stroke and see how long the top end lasts. Lol
I got a 2-stroke 2 cylinder 40 horsepower should I never do this let me know please I don't want to mess my outboard up. Thanks🙏
this is such a crock of 💩 sits in a 100k boat that would have 50k worth of motors, then walks over to a 10hp....(insert BS)
Ridiculous '' advice '' . Draining is not necessary as long as you use only ethanol free gas... and the stabilizer's only purpose is to hold the octane level up which will work up to 2 yrs.
er, being English; what is nnhn?
No help at all
you know fuel stabilizer works to then doing all that.
BS ,,, is all i can say ,,, It can go a month but gas we buy is crap today,, use some seafoam
Buy an EFI motor easy fix.. Done.
Is it possible to drain fuel on a 50 hp evinrude etec? What kindof fuel is best to use for it also, unleaded gas?
my 200 Yamaha 2 stroke wont get on top could it b the fuel pump ,it gos then slows down every 5 r 6 seconds?
my 200 Yamaha 2 stroke wont get on top could it b the fuel pump ,it gos then slows down every 5 r 6 seconds ?