I dont think anybody out there can break down the circuitry the way you do. Nothing like being able to see in your minds eye whats going on. I have been able to troubleshoot so much better w all your teaching and circuitry breakdown. Just amazing.
Had this problem with my small 2 stroke generator yesterday. Went through it after seeing this video, didn't actually see any issues, but after cleaning the system and tightening everything up, it now runs perfectly. Thanks for your help.
Thank you for this amazing video. I'm dealing with this issue and I ignored the carb as a culprit since its barely a year old. I now know how to be very thorough in my testing. My God bless you and keep you.
Carburetors have always scared me because I never understood them. Until I have been watching your videos!🙂 Now I have more knowledge of carburetors and their workings!👍 Much thanks to you Sir!🙂
Thanks for the video! I had this problem, and after watching this video, I was able to pinpoint the problem. It was the metering diaphragm. It had become too stiff with time and it wasn't allowing the needle valve to come off its seat and allow sufficient fuel flow to the main jet after taking off the choke. Out of curiousity, I compared the new diaphragm to old diaphragm, and the new one was much more flexible.
Great refresher for me. Used to race motorbikes forty years ago and had forgotten what I had forgotten if you know what I mean. Nice simple early 2 stroke tech, love it. Keep up the good work.
So very well done! Absolutely clear, concise and well shown. Couldn't imagine having it done any better. Cheers to an amazing job. Very much appreciated. Thank you!
I'm actually watching all of your applicable videos on two stroke engines because of my interest in flying 2 stroke engines on Paramotors. Not until today did I understand the low and high limit screws on my British made Parajet Maverick, that has an Italian 2 stroke engine made by Vittorazi. Oh by the way, your electrical explanation videos are great too.
Awesome Video.Everyone that works on engines should sit down and watch this.Thank's for sharing Your knowledge in a way that makes the whole fuel circuit easy to diagnose.
I think,one other problem could be that vacuum line(pipe) could be little cracked and fuel pump wont work very well and dont pump enough fuel. Thank you very much for this detailed explanations.
Excellence in action here, mate. Perfect presentation, clear explanation, perhaps showing actual examples of each component would help the inexperienced viewers even more. Not a criticism, encouraging the excellent work you have done.
Thank you, you just made a small problem bigger. BUT in doing so you increased our understanding. Which I think is a good thing. You educate us and that is the best thing of all.
all vids are great and very helpful. i did notice one lack or i missed seeing it. it is how a def hi ck valve preven ts purge bulb drawing in fuel and pushes out all fuel when in low speed. ck not closing on low circuit lets 14.7 lbs atmosphere pressure push into metering area pushing diaphragm away shutting off fuel supply and gradual starving down at low speed/idle and adding air to chamber and pushing all fuel out of purge bulb. with no ck /defective works good on hi speed and full choke starts ok 5-7 pulls like no purge bulb. engines. thanks for the great vids.
Another excellent video which clearly explains the majority, if not all of the 'fuel starvation/choke on' problems encountered with small engines. The only fun left now is work out which one of these issues you are having? 👍
An excellent explanation of the malfunctions of this type of carburettor! Maybe some advice about the fuel used. NEVER use alcohol containing petrol, this will dissolve the rubbers of the membranes. You can only see this clearly if you hold them up to a light. You then see the fine grid of the fabric on which the rubber was attached. These rubber particles contaminate the carburettor and all small holes need to be cleaned, sometimes very small ones.
Excellent video it seems that you are a specialist as your name on this video, I had a problem with the manifold loose the 2 screws that connect to the carburetor but i noticed that the gasket is missing so this may be the problem. Thank you
Very good video. I have learnt alot. Thankyou very much. First time seeing 1 of your videos. And ofcourse I subscribed. Great job teaching us. Thankyou☺
Thank you for this great explanation. I was having a hard time figuring out what is going on with my two stroke outboard and this has helped me identify the problem and fix it. :)
Great video. I had replaced the carb on my Echo trimmer and couldn't get it tuned. Watched the video and decided that maybe I should take it all apart and start fresh, thinking that maybe there was a leak somewhere. Took off the carb and even though I thought I still had the screws in far enough to hold the gasket, it was off on one side, hanging down. I continued checking tightness of everything and put it back together, making sure that the gasket was correct. Wet through setting it up from scratch again (idle speed, High and low needle valves) and had it running like new in a few minutes. Thank you for the great explanation.
Good morning Craig. Your videos are the very best how to's. You explain everything very clearly. I watch every one of your videos and learn something every time. Thanks for sharing.👍👍
Thanks a lot for the video... it really help me to solve the problem that i was having (choke cable was not fitted properly and leaking/breathing through the cable seat. Thanks again :)
I found the problem is usually an air leak in an old fuel line, the solution is cut off the cracked end and reconnect. It could also be in an old tank where the tank take up hardens and expands. Replace the old parts or wrap teflon tape to make the take up plug in tighter.
Good video, working on my Strimmer engine right now, after many years of no use (because it wasn't working correctly), found several faults, partial fuel filter blockage, leaking fuel tube inside of fuel tank and air filter blockage. Ran it after rectifying the faults and found it working on partial choke quite well, will try it under load tomorrow. Was going to buy a new electric strimmer so if successful you will have saved me much needed money (Pensioner). Many thanks for your info.
Excellent channel. My Stihl 600BR used to run well before a Stihl certified tune up. Now, it runs when the machine is warmed to room air, started and operated above 0 degrees C. At -30 degrees C, it starts and idles but bogs down as the throttle is advanced. I’m curious how to diagnose and fix this.
Carburettors, don’t you just love them!? Fuel/air mixture can be critical on a two stroke engine. I learned about fine tuning carbs when I had my tuned Yamaha 250 and 350 RDLCs. I certainly knew my way around Mikuni VM 26s and 28s.
Hi, have a weird problem where line trimmer starts and runs and i can add more fuel or lean per the screws but after a period when hot, it wont idle anymore. Part choke saves it but it not happy engine!! Have switched carbs (3) and gravity fed fuel and even cut the pump vanes off and fed it fuel in case the pulse channel was dying after a period, but why would that happen? unless piston bore clearance and pressures suddenly drooped off. so cant be fuel delivery problem or vent valve as bypassed all that. Also i quickly checked for spark when it died and seemed to be still sparking but too weak when hot? Could it be simply a weak coil thats dying when warm and spark not strong enough? Also one time after 15 mins it refused to go above half revs even when i pumped the throttle. Electronics in coil failing and restricting RPM? a few mins later it was back to full power and rev up down ect. I honestly thought this machine was haunted as intermittent running problem with plenty of juice available on start so good fuel and spark then but not good spark when warm? Would part choke save a weak spark situation ? Also when after start, idle screw needs to be changed a bit, it wont lock on to one setting. Comp test was around 100psi. cold. Could the engine be bleeding off suction and pressure when hot as its old? . 3 carbs , 2 new and 3rd completely rebuilt on this machine of varying throat sizes but they all idle and fail the same after about 15 to 30 mins. same symptoms. Also pressure tested engine and got 9 lbs, no leaks but replaced all seals and crank seal in case they were bleeding when hot. So engine is air tight. Baffling!! thanks if you can help...
Id be trying a coil,,,,i know its easy to just say and throw that out there from a chair but i would try a new coil and spark plug. This is of course is figuring all of the other basics are good which sounds like you got covered (vacuum leaks, etc). Love to know what you find. Stay safe and good luck
Do you have a spark arrestor on that unit? Pull it and check it. If clogged, use a propane or mapp flame to char it and brush off the soot. Interesting problem. I'm gonna assume you fixed it or had it fixed. What was the problem?
@@alext8828 Hi, i found the problem. You need about 90 psi for 2 strokes to work and i was getting 100 cold but only 70-85 hot?? and thus it couldnt run but took 10-20 mins to get hot and bleed off. Caused by worn bore and rings. Put new rings and checked hot and back to about 100 but the piston the bore clearance ect is not good so this wont last too long and that will be that for this machine . Good learning experience and i had to work this out myself as engines are supposed to increase psi as they warm up not the opposite. 2 strokes are very picky as they have to compress and suck the mixture in, so clearances are very tight. Thanks for replying. all good now..
I've just dealt with my " the handy" strimmer. The beast kept dying off choke. The fuel supply line had snapped. No vacuum equals no draw of fuel. Resulting in a dead cut.
@@TheRepairSpecialist I checked the tank, I even bought another tank and was going to install it today. But I never tested the vent. I'm certain this is what's happening. The tank is warped kind like there was excess suction inside it like a gas can does in the cold. I don't know why it didn't occur to me sooner, I've even seen it suggested in other videos. I've been through the whole outboard at this point. It runs like a top until you open her up. That's gonna change today thanks to you sir. This old pontoon has a fuel fill and vent attached to a broken trim ring and they're all super weathered. I'll replace it all but for today I'll take your suggestion and leave the cap slightly loose. I can't wait for my family to wake up lol. Your walk through on how all this stuff works and works together is the best on UA-cam. I'm grateful to have found your channel
The 2 stroke engines must be able to exhale freely. If the engine idles but has no power, or simply won’t accelerate, and you checked all the first eleven things you might check for restriction to the exhaust. This maybe a piece of woven wire in the muffler that has accumulated over time exhaust oils baked on the screen installed as a flame, or spark arrester. Exhaust holes at the piston exit can build up crud and restrict the exhaust also. This takes many seasons to accumulate, but the seasons pass quickly, it maybe older than you remember.
Oh small 2 strokes…. I have a collection of mixed Echo and Stihl, my diagnostic starts with throwing on a new carb and usually that solves my problem(s)
Wow...very very well explained. Just what i need to fix my weed eater.... BUT my carb got only one screw,, just above where the inline fuel pipe connects with the carb... 🤦♂️ There is no H or L... 🤷♂️
Thank you for your nice feedback. Its very much appreciated. Take a look at this other video of mine, which explains the basics on single adjuster screw systems on carburetors. It might help make things a little clearer. Here it is: ua-cam.com/video/oDkVVL0CJqk/v-deo.html . Thanks. Craig
SIR i'd like to ask, i have Chinese chainsaw 52CC (stihl MS5200 - not genuine Stihl) bought it last December 20, 2021 after typhoon RAI hit in my country that wreaked havoc in Central Visayas area, Philippines. After weeks of continues used by cutting trees the engine started to run abnormally up until now, though still usable. After few minutes of running, when I revv the engine the sounds will changed (PROT PROT PROT SOUND) like out of fuel and then I dies, when in fact it was half full-full tank, but when IDLING the sound is normal. I already adjusted the LH and Carb dials so I can get the correct air and fuel mixtures. It will just run few minutes and back to the problem again. So, what I did was I cleaned the carburator (disassemble & assemble) and the clutch (i didn't detached) brushing only. Still the problem not solved. LAst week I bought new Carburator and Fuel breather and installed it correctly, after few minutes of running the still the problem persist. The PROT PROT PROT sound not solve and then the engine dies. WHAT COULD BE THE CULPRIT? I've been searching this problem months now in the internet, but I haven't seen any videos/articles that could address my chainsaw problem..I'm thinking Maybe you have an answer for this.. Hoping for your reply. Thanks in advance.
Different types of two stroke oils and different mix ratio's can effect how the two stroke engine performs. I haven't known it where the engine will only run on choke because of this though.
@@TheRepairSpecialist Thankyou for your reply, I have watched 2 videos that you have made on the subject and am still narrowing down the possibility of what the problem is with both my hedge trimmers.
Hello, I have a back pack stihl leaf blower Ive done all this stuff to this thing fresh fuel, tank vent good,new carb actually 2 carbs the last one is original eqip.Anyway same thing on bogging and sometimes wont start yet running good while chocked a little bit ,even better when i shake up the gas tank to give it more pressure.,,Crazy thing is when i open the gas cap it will then just die out..The muffler is clean the cylinder looks new no scoring only thing left I was thinking is the crank seals?what do you think? any suggestions? Thanks! B.
All Episodes -for 2-Stroke Carburetors Here. Thanks. Craig:
ua-cam.com/play/PLrlXp3PlwgRI5OLvm3P91LJr1CYnO5TRD.html
This is gold for everyone like me, who has knowledge but not comprehensive. Now we have it all. I'm talking about whole series. My bow, Sir.
This is the best clearest and most comprehensive explanation of possible faults with a carburettor that I have listened to!
Well done and thankyou!
Thank you so much. It’s comments like yours that motivate me to continue making videos. Thanks again. Craig 👍👍👍
Best description of carb/fuel issues on UA-cam. It helped a lot of people and also made a few of small engine repairmen angry I’m sure. Thank you..
By far the goto channel for real diagnostic work on unsolvable problems you might face.
I dont think anybody out there can break down the circuitry the way you do. Nothing like being able to see in your minds eye whats going on. I have been able to troubleshoot so much better w all your teaching and circuitry breakdown. Just amazing.
Thank you so much for your nice feedback. It's comments like yours that motivate me to continue making these videos. Craig 😀👍
Wow, what a good explanation! Not only for choke issues but also for how a carb works in general.
Had this problem with my small 2 stroke generator yesterday. Went through it after seeing this video, didn't actually see any issues, but after cleaning the system and tightening everything up, it now runs perfectly.
Thanks for your help.
Awesome. I’m pleased you sorted out the issue. Craig
THANKS FOR TAKING THE TIME TO GO INTO DETAIL ABOUT THIS TOPIC.
This is one of the most comprehensive videos explaining Choke and issues related to fuel on UA-cam! - Well Done!
Thank you. I really appreciate your king feeeback. Craig 👍👍👍
Best channel for small engines.
Thank you so much for your nice feedback. It's comments like yours that motivate me to continue making these videos. Craig 😀👍
Thank you for this amazing video. I'm dealing with this issue and I ignored the carb as a culprit since its barely a year old. I now know how to be very thorough in my testing. My God bless you and keep you.
Awesome thank you. Craig
I feel like I've learned more useful information in this video than I did the whole time I was in school,,, very well done
OMG thank you so much! Fix my backpack blower through the ol’ elimination process because of this video. My issue was leaking fuel lines. FIXED! 🛠
Carburetors have always scared me because I never understood them. Until I have been watching your videos!🙂 Now I have more knowledge of carburetors and their workings!👍 Much thanks to you Sir!🙂
You win DIY youtube informational videos!! Excellently done Sir!!
Lead source of choke only idle. It was fuel shut off valve. 2 days of troubleshooting solved! Thank you!
Thanks for the video!
I had this problem, and after watching this video, I was able to pinpoint the problem. It was the metering diaphragm. It had become too stiff with time and it wasn't allowing the needle valve to come off its seat and allow sufficient fuel flow to the main jet after taking off the choke. Out of curiousity, I compared the new diaphragm to old diaphragm, and the new one was much more flexible.
Great refresher for me. Used to race motorbikes forty years ago and had forgotten what I had forgotten if you know what I mean.
Nice simple early 2 stroke tech, love it. Keep up the good work.
Thank you so much. Craig
FROM ACROSS THE WATER, VERY WELL DONE MATE, THANK-YOU SO MUCH !!
Of all the videos I have watched on this issue yours is the holy grail! Wish I had found it sooner...thank you!
Thank you for your awesome feedback, I really appreciate it. Craig 👍
One of the best videos I’ve ever seen! Thank you so much it has explained so much
Brilliant job and IMO the UK accent adds a bit of authority to the instruction!!
You just save me huge headaches. Thanks so much. I didn’t even know my snow blower had a fuel adjustment screw. Fixed my problem without any tools. 👍
So very well done! Absolutely clear, concise and well shown. Couldn't imagine having it done any better. Cheers to an amazing job. Very much appreciated. Thank you!
I'm actually watching all of your applicable videos on two stroke engines because of my interest in flying 2 stroke engines on Paramotors. Not until today did I understand the low and high limit screws on my British made Parajet Maverick, that has an Italian 2 stroke engine made by Vittorazi. Oh by the way, your electrical explanation videos are great too.
Awesome Video.Everyone that works on engines should sit down and watch this.Thank's for sharing Your knowledge in a way that makes the whole fuel circuit easy to diagnose.
Very informative. I never really understood the process. Thank you very much for this knowledgeable video.
I think,one other problem could be that vacuum line(pipe) could be little cracked and fuel pump wont work very well and dont pump enough fuel.
Thank you very much for this detailed explanations.
This finally happened to me with our chainsaw. Thank you so much for this wonderful knowledge and resources on this site
Excellence in action here, mate. Perfect presentation, clear explanation, perhaps showing actual examples of each component would help the inexperienced viewers even more. Not a criticism, encouraging the excellent work you have done.
Thank you, you just made a small problem bigger. BUT in doing so you increased our understanding. Which I think is a good thing. You educate us and that is the best thing of all.
Excellent fluent presentation from one who knows machines.
Thank you. I really appreciate your nice feedback. Craig 👍
THANKYOU FOR THE CLARITY AND CLEAR EXPLANATION '''MAGIC MAN'' CHEERS....
all vids are great and very helpful. i did notice one lack or i missed seeing it. it is how a def hi ck valve preven
ts purge bulb drawing in fuel and pushes out all fuel when in low speed. ck not closing on low circuit lets 14.7 lbs atmosphere pressure push into metering area pushing diaphragm away shutting off fuel supply and gradual starving down at low speed/idle and adding air to chamber and pushing all fuel out of purge bulb. with no ck /defective works good on hi speed and full choke starts ok 5-7 pulls like no purge bulb. engines. thanks for the great vids.
Great video. So simply put , it's either a fuel blockage or air leakage.
I absolutely love the educative nature of your videos -- the theory, practicality, and reasons. Thank you!
Another excellent video which clearly explains the majority, if not all of the 'fuel starvation/choke on' problems encountered with small engines. The only fun left now is work out which one of these issues you are having? 👍
Yes, Thank you for mentioning that. I should have included it in the video. Thanks again. Craig
Pretty much start at 1.....
ANOTHER 10/10 VIDEO WELL DONE EAC
An excellent explanation of the malfunctions of this type of carburettor!
Maybe some advice about the fuel used.
NEVER use alcohol containing petrol, this will dissolve the rubbers of the membranes.
You can only see this clearly if you hold them up to a light.
You then see the fine grid of the fabric on which the rubber was attached.
These rubber particles contaminate the carburettor and all small holes need to be cleaned, sometimes very small ones.
watched a few of your videos and will watch more. good drawings to help understanding as well as good descriptions.
Excellent video it seems that you are a specialist as your name on this video, I had a problem with the manifold loose the 2 screws that connect to the carburetor but i noticed that the gasket is missing so this may be the problem.
Thank you
I really enjoyed that, I think I now have a rough idea as to why I can't get my lawnmower running. 👍
Thank you so much for the nice feedback. I really appreciate it. Craig
Bravo! Your time is greatly appreciated.
Very good video. I have learnt alot. Thankyou very much. First time seeing 1 of your videos. And ofcourse I subscribed. Great job teaching us. Thankyou☺
Really thorough overview and in the order of operation. Best teaching video.
Thank you for this great explanation. I was having a hard time figuring out what is going on with my two stroke outboard and this has helped me identify the problem and fix it. :)
Best Video on all carb issues
It's a Beautiful work, Master.
Great video. I had replaced the carb on my Echo trimmer and couldn't get it tuned. Watched the video and decided that maybe I should take it all apart and start fresh, thinking that maybe there was a leak somewhere. Took off the carb and even though I thought I still had the screws in far enough to hold the gasket, it was off on one side, hanging down. I continued checking tightness of everything and put it back together, making sure that the gasket was correct. Wet through setting it up from scratch again (idle speed, High and low needle valves) and had it running like new in a few minutes.
Thank you for the great explanation.
Thanks Fantastic. I'm really pleased it's up and running. Many thanks for your awesome feedback as well. Craig 👍👍👍
Thanks. for this.. Saw 👀 your channel just before I started stripping the carburettor down! Fuel filter was blocked! Working fine now!
Excellent Carb Presentation....
The Best of the Best.
Wow, thank you! I really appreciate it. Craig 👍👍👍
Good morning Craig. Your videos are the very best how to's. You explain everything very clearly. I watch every one of your videos and learn something every time. Thanks for sharing.👍👍
Thank you so much for your nice feedback. It's comments like yours that motivate me to continue making these videos. Craig 😀👍
@@TheRepairSpecialist Well I say what I am thinking. Besides I heard that we Canadians are polite. 🍁😁
Thanks a lot for the video... it really help me to solve the problem that i was having (choke cable was not fitted properly and leaking/breathing through the cable seat. Thanks again :)
great video .What about when chainsaw only idles on 3/4 choke. Could it be from the same things explained?
I found the problem is usually an air leak in an old fuel line, the solution is cut off the cracked end and reconnect. It could also be in an old tank where the tank take up hardens and expands. Replace the old parts or wrap teflon tape to make the take up plug in tighter.
amazing video! keep up the great work
Extraordinary explanation and presentation!
Thank you so much :D really appreciate it :)
- Craig
I enjoyed the video. Awesome explanation on all the parts and how they work.
Thank you. I appreciative your nice comment. Craig 👍
Thank you for the shout out my friend.
Thank you to 👍👍👍
Thank you very good.My Evinrude thanks you too. Now we can go sailing👍
I always love your vids. You're very thorough with your explanation s. Thanks so much.
Yes, Thank you for mentioning that. I should have included it in the video. Thanks again. Craig
Good video, working on my Strimmer engine right now, after many years of no use (because it wasn't working correctly), found several faults, partial fuel filter blockage, leaking fuel tube inside of fuel tank and air filter blockage. Ran it after rectifying the faults and found it working on partial choke quite well, will try it under load tomorrow. Was going to buy a new electric strimmer so if successful you will have saved me much needed money (Pensioner). Many thanks for your info.
Thanks God for sharing your knowledge about this matter, very impressive and helpful.
Thank you very much,I've learn something secret about caburator & H&L screw settings of fuel amount entering the chember
Excellent information as always. Thank you Craig.
Great job as usual !
Thank you so much for the nice feedback. I really appreciate it. Craig
Awesome tutorial. Thanks for sharing.
Thank you so much. Craig 👍👍
Great stuff my brother thanks for your time and expertise!🙏🏻
this is a great video , very informative
Thank you so much for your nice feedback. It's comments like yours that motivate me to continue making these videos. Craig 😀👍
Your a legend mate, thankyou, really appreciated. 🇦🇺
Very informative, thank you
Excellent channel. My Stihl 600BR used to run well before a Stihl certified tune up. Now, it runs when the machine is warmed to room air, started and operated above 0 degrees C. At -30 degrees C, it starts and idles but bogs down as the throttle is advanced. I’m curious how to diagnose and fix this.
You are genius!! God bless you!! ❤
Have this problem right now, 450 sthill. Thank you very much sir.
Thank you for your feedbck. I hope you got it running ok. Craig 👍
Likely the best run through of the causes of this problem on the web! And then there is a longer, more comprehensive "full" version too? I am onboard.
Great job. Thank you!
Very well done Sir!
Thank you kindly! 👍👍
Superb and valuable vid, thanks.
Thank you! Very good video.
Thats Totally Unreal I ONLY THOUGHT I KNEW About These Small Engines, But I Dident Know Squat
Carburettors, don’t you just love them!? Fuel/air mixture can be critical on a two stroke engine. I learned about fine tuning carbs when I had my tuned Yamaha 250 and 350 RDLCs. I certainly knew my way around Mikuni VM 26s and 28s.
Awesome 👍
Awesome, and Thank you.
Thank you too! I really appreciate your comment. Craig
Hi, have a weird problem where line trimmer starts and runs and i can add more fuel or lean per the screws but after a period when hot, it wont idle anymore. Part choke saves it but it not happy engine!! Have switched carbs (3) and gravity fed fuel and even cut the pump vanes off and fed it fuel in case the pulse channel was dying after a period, but why would that happen? unless piston bore clearance and pressures suddenly drooped off. so cant be fuel delivery problem or vent valve as bypassed all that. Also i quickly checked for spark when it died and seemed to be still sparking but too weak when hot?
Could it be simply a weak coil thats dying when warm and spark not strong enough? Also one time after 15 mins it refused to go above half revs even when i pumped the throttle. Electronics in coil failing and restricting RPM? a few mins later it was back to full power and rev up down ect. I honestly thought this machine was haunted as intermittent running problem with plenty of juice available on start so good fuel and spark then but not good spark when warm?
Would part choke save a weak spark situation ? Also when after start, idle screw needs to be changed a bit, it wont lock on to one setting. Comp test was around 100psi. cold. Could the engine be bleeding off suction and pressure when hot as its old? . 3 carbs , 2 new and 3rd completely rebuilt on this machine of varying throat sizes but they all idle and fail the same after about 15 to 30 mins. same symptoms. Also pressure tested engine and got 9 lbs, no leaks but replaced all seals and crank seal in case they were bleeding when hot. So engine is air tight.
Baffling!!
thanks if you can help...
Id be trying a coil,,,,i know its easy to just say and throw that out there from a chair but i would try a new coil and spark plug. This is of course is figuring all of the other basics are good which sounds like you got covered (vacuum leaks, etc). Love to know what you find. Stay safe and good luck
Do you have a spark arrestor on that unit? Pull it and check it. If clogged, use a propane or mapp flame to char it and brush off the soot. Interesting problem. I'm gonna assume you fixed it or had it fixed. What was the problem?
@@alext8828 Hi, i found the problem. You need about 90 psi for 2 strokes to work and i was getting 100 cold but only 70-85 hot?? and thus it couldnt run but took 10-20 mins to get hot and bleed off. Caused by worn bore and rings. Put new rings and checked hot and back to about 100 but the piston the bore clearance ect is not good so this wont last too long and that will be that for this machine . Good learning experience and i had to work this out myself as engines are supposed to increase psi as they warm up not the opposite. 2 strokes are very picky as they have to compress and suck the mixture in, so clearances are very tight. Thanks for replying. all good now..
@@xx3868 Glad to hear it. BTW, ring clearance is the thing to watch. Piston clearance is secondary. I think you'll be fine for a long time. Good luck.
I've just dealt with my " the handy" strimmer. The beast kept dying off choke.
The fuel supply line had snapped. No vacuum equals no draw of fuel. Resulting in a dead cut.
But what about a engine that only starts when holding the gas wide open like my chain saw?
I appreciate you sir. Thank you for sharing your skills knowledge and experience
Thank you so much for your appreciation and nice feedback. I really appreciate you. Thank you. Craig 👍
@@TheRepairSpecialist I checked the tank, I even bought another tank and was going to install it today. But I never tested the vent. I'm certain this is what's happening. The tank is warped kind like there was excess suction inside it like a gas can does in the cold. I don't know why it didn't occur to me sooner, I've even seen it suggested in other videos. I've been through the whole outboard at this point. It runs like a top until you open her up. That's gonna change today thanks to you sir. This old pontoon has a fuel fill and vent attached to a broken trim ring and they're all super weathered. I'll replace it all but for today I'll take your suggestion and leave the cap slightly loose. I can't wait for my family to wake up lol.
Your walk through on how all this stuff works and works together is the best on UA-cam. I'm grateful to have found your channel
Thank you Sir, for the video.
awesome explanation 👍cheers
Quality 👍
Thank you so much for the nice feedback. I really appreciate it. Craig
My outboard runs fine when cold but after running a while it starts doing this it makes no sense why it wouldn't do it all the time
Induction coil issue often causes this. As it heats up a fracture in the internal wire expands killing the power to the spark plug.
The 2 stroke engines must be able to exhale freely. If the engine idles but has no power, or simply won’t accelerate, and you checked all the first eleven things you might check for restriction to the exhaust. This maybe a piece of woven wire in the muffler that has accumulated over time exhaust oils baked on the screen installed as a flame, or spark arrester. Exhaust holes at the piston exit can build up crud and restrict the exhaust also. This takes many seasons to accumulate, but the seasons pass quickly, it maybe older than you remember.
Excellent video.
Very good!
Oh small 2 strokes…. I have a collection of mixed Echo and Stihl, my diagnostic starts with throwing on a new carb and usually that solves my problem(s)
Wow...very very well explained. Just what i need to fix my weed eater.... BUT my carb got only one screw,, just above where the inline fuel pipe connects with the carb... 🤦♂️ There is no H or L... 🤷♂️
Thank you for your nice feedback. Its very much appreciated. Take a look at this other video of mine, which explains the basics on single adjuster screw systems on carburetors. It might help make things a little clearer. Here it is: ua-cam.com/video/oDkVVL0CJqk/v-deo.html . Thanks. Craig
SIR i'd like to ask, i have Chinese chainsaw 52CC (stihl MS5200 - not genuine Stihl) bought it last December 20, 2021 after typhoon RAI hit in my country that wreaked havoc in Central Visayas area, Philippines. After weeks of continues used by cutting trees the engine started to run abnormally up until now, though still usable. After few minutes of running, when I revv the engine the sounds will changed (PROT PROT PROT SOUND) like out of fuel and then I dies, when in fact it was half full-full tank, but when IDLING the sound is normal. I already adjusted the LH and Carb dials so I can get the correct air and fuel mixtures. It will just run few minutes and back to the problem again. So, what I did was I cleaned the carburator (disassemble & assemble) and the clutch (i didn't detached) brushing only. Still the problem not solved. LAst week I bought new Carburator and Fuel breather and installed it correctly, after few minutes of running the still the problem persist. The PROT PROT PROT sound not solve and then the engine dies. WHAT COULD BE THE CULPRIT? I've been searching this problem months now in the internet, but I haven't seen any videos/articles that could address my chainsaw problem..I'm thinking Maybe you have an answer for this.. Hoping for your reply. Thanks in advance.
Can a different 2 stroke oil or mix cause an engine to run on choke only?
Different types of two stroke oils and different mix ratio's can effect how the two stroke engine performs. I haven't known it where the engine will only run on choke because of this though.
@@TheRepairSpecialist Thankyou for your reply, I have watched 2 videos that you have made on the subject and am still narrowing down the possibility of what the problem is with both my hedge trimmers.
Excellent!!!!!
Thank you! Cheers!
Hello, I have a back pack stihl leaf blower Ive done all this stuff to this thing fresh fuel, tank vent good,new carb actually 2 carbs the last one is original eqip.Anyway same thing on bogging and sometimes wont start yet running good while chocked a little bit ,even better when i shake up the gas tank to give it more pressure.,,Crazy thing is when i open the gas cap it will then just die out..The muffler is clean the cylinder looks new no scoring only thing left I was thinking is the crank seals?what do you think? any suggestions? Thanks! B.