Surging Briggs & Stratton Opposed Twin Lawn Tractor Engine - Let's Fix It!
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- Опубліковано 29 вер 2024
- Sorry for the narrow screen, I had some technical difficulties
Briggs & Stratton Opposed Twin Engine Surging - Let's Fix It!
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Mine was the oil sump gasket but I would try cleaning the carb first, nice video
The first jet was the high speed jet...not the problem. Did the motor serge when it was new? If no, then why does the jet size need to be bigger? Seems to me that there is not enough fuel GETTING to the jet.
Yeah, I am actually confused by his wording. Is he actually enlarging the jets by barely drilling them out or was he just "enlarging" them by getting a small enough drill bit to unclog them? It looked like he just poked them down in the jet holes to free them up instead of actually drilling it, but then he did say you could use the air to blow out the shavings. Either way, you would be correct in saying it wasn't getting enough fuel.
Great job!
I've the same engine, carburetor, craftsman mower and had a similar surging problem. Repeated jet and carb cleaning, replacement of the inline fuel filter, carb pump kit etc. nothing fixed the problem.
Finally isolated the problem by drawing gas through a short length of gas line from a cup of gas and through the inline filter. Doing that, no more surging.
Solution: The connection of the gas line to the gas tank located under the rear seat. The hose where it pushed onto the barb fitting of the gas tank was deteriorated and cracked. It didn't drip of leak gas in any obvious way but once I cut off that first inch of fuel line and reconnected it to the tank barb fitting the surging problem was eliminated.
The cause? I assume that air was being sucked into the fuel line through the cracks around the barb fitting but I don't know that to actually be the reason. My doubt is that the fuel filter is transparent and I don't recall observing any air bubbles going through that filter. None the less, cutting off the section of bad hose on the tank barb fitting is the point when my surging problems ceased.
Briggs Opposed Twin 👍
Looks like the Opposed Twin runs as smooth as the V Twin. I guess years of experience taught you that widening those jets was the most common fix and how much for each. I'd love to have a Twin, but both of my lawn tractors came with Single OHV. Another great one, Don. Thanks
Any concerns about bits from the drilling blocking a passage?
Thanks for sharing your time ,knowledge and resources. Best to you and yours 👍🏁
Stihl chainsaw MS 261. I'm having ignition Coil problems.What does the three lines of numbers mean?what does line say?,
I lived on long Island ( sea level) I bring my gas tools to SUMMIT/CATSKILLS 2300ft above sea level. Very sad they don't have needle valves😮
Might be a good idea to rinse the drill chips out before you reinstall the plug. Carbs don't like debris in there.
The tool you used is not a screwdriver, it's a pin vise.
2 vids on the weekend, your awesome!!!! I know it's only a lawn tractor but it drive me absolutely insane that people can't clean their equipment. Awesome fix as always good Sir
I actually have an adjustable carb on my briggs opposed twin and let me tell you what a pain in the ass . I can dial it in to run perfect and after working for the day it requires re adjustment the next time I run it ..every time ..
I hav eBoth the " 19 and the 20 " hp versions of this i/c Series - been looking forever on an Up Close Clear View of Complete Governor Settings and adjustments - these have the Outter Governor spring slide systems whee a long screw goes through a double hook slid down through a spring that acts as the governor its self - external governor
I put afew ounces of seafoam in a Briggs 8hp snowblower engine and got rid of it surging. Haven't had a problem since.
may i ask what micro drill bit set you have or where purchased from?...
Did I miss why you enlarged the jets? I know this engine ran fine at some point with the jets at a smaller size.??? I think I know why but others here may not.
Maby if it didn't have all that crsp on it
It's crap that these carbs don't have adjusting screws.
Wondering if you have a video on the Premix gas available at big box stores and what you thoughts are on it.
why wasn't this fuel starvation surging a problem when the customer first bought the machine? is there some engine wear that happens over time creating the issue where it needs more fuel?
I did all those things but just cleaned rather than enlarged. I did take that main jet out to clean.
I’ve thought about the need for this when it likely ran fine for years since new until recently and I assume that these carbs are set from the factory at peak performance/efficiency and when the engine wears over time, the reduction in compression changes the amount of air and fuel sucked in from the carburetor so you have to richen it slightly to compensate.
I have had quite a few of those engines over the years and I currently have two... One of which is that exact same machine. I had to replace the foam gasket on the throttle shaft on mine to get it to stop surging. Mine ran great until i hit a big bump which compressed the foam gasket which was rotten and that made it lean. The machine was a freebee so I was doing a bunch to it at the time anyways. What I love about those carbs is how easy that top comes off when I get water in the fuel, its an easy fix. Something to watch for when reinstalling the top of the carb is that the float can get jammed up and the fuel with over flow out of the carb when you start it, simply loosen the 4 screws and shift the top a little to get the float to be free moving.
You really do an excellent job of filming while you work!
Yea well what's the fix for one of there plastic carbs
That’s pretty cool about enlarging the Jets I think that’s from the EPA where they made Briggs make the Jets too small we’re trying to see if they environments what they think but when you make those big engines star for fuel, they don’t work very well so you got to give him the gas if they needed to keep them running Good job look forward to the next video.
Yea I find that a lot as well, especially with 2 stroke stuff. I’ve fixed so many little weedeaters and blowers by tweaking the H/L jets out 1/8-1/4 turn, problem is you gotta have a 21+ piece driver set to have a chance at having the correct one the adjust it with. They are set up on the cusp of being too lean to begin with that the second something changes, like the engine breaking in , it won’t run at all.
This causes people to just throw them away every year or 2 and buy new. How good does that sound for the environment? Most of the stuff I’ve fixed has been “throwaway stuff” but it’ll definitely last more than 2 years
Your opignon about gaz?
Now all gaz contain up to 10% of éthanol do you still recommand premium gazoline in small engine ? Or dont waist money!
I still recommend premium because I think it has a longer shelf life.
Use a real camera
Donny is my go to, to find the correct repair video and he does it without drinking a beer.
Hi Donny, thanks for the great video. I do have the exact same tractor and opposed Twin. I'm waiting for my micro drill bits to do the job (having this annoying surge...). My question, on this very same engine, is a good thing to clean the heads and reset the valves? This not being a OHV, a proper valve setting is a lot more work, but is it worth it?
Thanks again.
Alain
Idon't do it if there are no issues, very, very rarely have I had to adjust valves.
Thank's Donny, my hesitation comes from fact this as been a great engine like you say , but in the last year it is hard to restart when hot. The motor is very clean for perfect airflow. I do have this surging problem which you've showed us how to fix. Some say my shaft could be slightly bent with the flywheel turning and hot can reduce the coil efficiency. I'm studying all reactions and testing, but thanks again.
@@silenceondort1314 Did drilling it out solve your surging issues?
Donyboy73.gracias por ese video yo tambien Tengo El MISMO problema o sintoma. Gracias por tu explication
Dony never steers me wrong.
Thanks for saving me hours of frustration. I drilled out the .040 jet then had to do the other. RUNS AS NEW.
THANKS AGAIN.
that engine looks like a newer model to have a 3 screw fuel pump carb.most of the ones i saw that recent had the 4 screw carbs.they are great little engines though.used my 40 cube both summer & winter over 20 years with no major issues.just a coil replacement once, & routine maintenence every year.hope my 42 oil pump model last even longer.people say there thirsty on fuel, i havent found that to be true on either of mine.between the 40 & 42.i should be set for life on lawn tractor engines.KNOCK ON WOOD!!!
I'll bet it didn't cost the customer nothing. 😄
But the man has to be paid! One hour labor. That's fair. But then, Dony is a nice guy and may let the guy skate, which creates good will and more work in the future. I wonder how it will go.🤔
The suspense is killing me.😵
😄👍
So we get the drill...boring a carb...lol.
Nice fix sir...thanks for sharing.
Cheers from NB
Awesome diagnosis Dony !! So helpful 👍 Thank you !
Another very clear precise well explained video from you. Thank you again. I just restored the exact same machine as shown from scrap with a 21 HP opposed and could find very little online about it, being the 1st I have had. Mine surges too so I am about to get into it thanks to your info.
Dony, you must be the big "Five Oh" in age now. Happy Birthday!🎂
LOL, maybe if the owner washed the mud off it would run better. 😮
4:49 those look like air bleeds on a Holley carb.
I've encountered on other engines there will actually be a slightly larger replacement aftermarket jet that could be used if a person didn't want to drill it out. Obviously only works if the jet is actually removeable
A lot of times when my opposed twin Briggs surges at idle, I will go full throttle and then quickly throttle down while at the same time pulling the choke. This apparently creates a high vacuum and sometimes clears the jets. There can be another problem besides dirt in the jets, but this often works for me on various lawnmower engines. Thanks for the video.
I have always wondered. Thanks again Donyboy 73!!
Dony, I have been watching your repair videos for a month or so now and they are very educational, full of wisdom, and formatted in such a way that is really helpful with up close angles on what you are working on.
Do you have any videos that show transaxle repairs or conversions? I would love to see videos on those and learn as I am currently working on a similar project myself.
Respectfully, thank you.
I have this engine in my 1996 lawn tractor and I had the same issue 2 years ago. The problem was the hole between the fuelpump and the bowl was partially clogged. To check this, you have to remove the barrel with the float, and crank the engine and see if gas is squirting of the hole I also cleaned the rest of the carburetor. I don’t have that Walbro carburetor, I have the Nikki 6 which is similar but the pattern on the fuel pump cover is different in the Nikki 6 carburetor with 4 screw instead of 3. The tractor had run perfectly fine since I cleaned that hole. This engine is the best lawn tractor sounding engine ever.
The early versions of this carb had an adjustable screw where that "fixed" jet is.
And that folks is what years of experience gives you. Thanks for sharing this with us. Terrific job.
Oh Donyboy, thank you so much. I have a tractor with the same engine that surges. I have replaced everything including the carb and it still does it. I have got to try this fix on my engine.
Thanks Don, this has been a recurring problem for my twin cylinder unit. Cheers
My regular riding mower does the same thing and, has the same engine and carb. I cleaned and rebuilt the carb and, it only lasted 1 season. This spring, it started to surge again. Now, I know what I'm up against. Thanks for sharing. Merci beaucoup Don.
Good one! I had an opposed twin turbo cooled Craftsman in the shop a few months ago for deck problems.
Great info buddy. Thanks
YES! My tractor does this except on full throttle so I'm going to do this!
Dony, sharing this with a neighbor. Great looking video too!
Thanks for sharing the knowledge
Nice video but I don’t care for the vertical format.
Aloha Dony..great video. I'll have to look for that drill bit tool..thanks
Is it the newer fuels that make it run lean? Thanks Don
well that was a good fix for an old man lol you been here a long time
Very satisfying to see the tractor run nice after. Thanks! 👍🙂
Very helpful i will have remember to do that thank you for the video
Working on an engine opposed cyl from a corvair, great engines👍
Thanks again💥 Sir" Dony'🛠
Do you sell used parts?
Awesome great fix
Great video!🤩🤩
Thanks Dony
Thanks 🙏 😊😊
Nice work 👍
👍👍👍.Thanks
👍👍👍
Do you see many of these engines up in Canada?
I own 3 of them as they are one of my favorite small engines to have around. The carburetors leave a lot to be desired, but the Walbro can be retrofitted with full mixture adjustments which make it better to deal with. But the sound, torque and reliability are what make them great to have.
Great video!
I'm in Ontario and this 21 HP opposed is the 1st of about 30 riders I have restored. Only bad thing I have read is that this engine only uses an oil splash type system so if I owned one I would use synthetic and always keep the oil level high for the upper piston.
@@tommagiera4784 Yes, that is probably the biggest downfall of the B&S opposed twin. They did make a number of engines in the later years which used full pressure lubrication, but they are very rare and often bought up by those interested in these engines when they do come up for sale. If you're really lucky, you will find a 46 cubic inch, full pressure lubrication opposed twin (as most of them were 40-42ci with splash lubrication). I still hope to have one myself someday when the opportunity arises.
Are there Chinese carburetors for this application that do have adjustment screws? Or are aftermarket carburetors banned from having adjustment screws?
You can get aftermarket carburetors for these engines, however they use the newer "Nikki" design which does not have any mixture adjustment screws whatsoever. The older Walbro carburetors (such as the one featured in the video) can be easily retrofitted for full mixture adjustment, but doing so on the Nikki is more difficult and would probably require machining.
It's unfortunate because the Nikki carburetor is a superior design otherwise, mainly due to it having a transfer slot for eliminating flat spots that the Walbro carburetors commonly suffer from when throttling up quickly.
@@AtomicFallout757 for the opposed I got an aftermarket the same style as the original. I've never seen Nikki on the oppostwin, just the vtwin
@@gadasavideos8564 The Nikki carburetors for the opposed twins use what people refer to as the "4 screw fuel pump" design whereas the Walbro uses the "3 screw fuel pump" design.
The screw count refers to how many screws hold the fuel pump together at the front of the carburetor, making it easily identifiable as a Nikki or Walbro.
You can see in the video, the tractor Don is working on has 3 screws on the fuel pump, indicating a Walbro. There are more differences between the two of course, but that is the giveaway.
@AtomicFallout757 I wasn't aware that the 4 bolt were actually Nikki carbs, just thought they were an upgrade to the 3 bolt. The non pump parts of the 3 and 4 seem pretty much the same to me.
It is easier to take the carb off and rebuild it
I agree, most times it's easier, but in this case l found the problem is the Allen head jet behind the drain plug, slightly clogged. I even made a slot on 5/8 drain plug and also slotted Allen head brass jet with Dremel tool. Now I just need flat screwdriver. One of the best mower engines ever, just my opinion 😊
Nice job. How do you know the angle to drive the drill bit?
My guess is the jet is on a slight angle and he's just following it's hole.
@@blackenedmagic888 "he's just following it's hole" that's funnier than it should be.
My suggestion would be, before you open the jets with the top off, that you check/verify that the float level is correct. To me it seemed like it was. Also, putting the float at its upper/higher end of the spec can help it run better, and can be reversed if you don’t like how the engine runs.