donyboy73: 89lbs compression is very low, you may want to look at the piston through the muffler port
JOE Z: Hi Dony,
Maybe you can let me know what I am missing. My Craftsman 36cc 16" chainsaw was bogging down the last time I used it. I cleaned everything down including the carburetor & spark arrestor. The diaphragm, gaskets were all good. It has spark and a new plug with compression at 89lb. It would not start. Then flooded. Then started but could not get it going again. I set the low & high screws at 1.5 turns out & went up to 2 full turns. Any ideas?
donyboy73: you probably need to turnout the L and H screws slightly
Thomas Borror: Thanks to all for a great job on helping others with your know how on everything. This is my first time at this. I have a 1950 model poulan wood shark it is about 10 years old. I went to use it one day and when I started it it started fine but when I pressed the trigger it bogged out on me. 10 times latter and pissed off. I replaced the fuel lines/ filter /cleaned carb/ screen on muffler/ fresh gas/ good primer bulb adj carb. It does the same thing. it starts and runs press trigger it bogs HELP.
Alan Sim: My father in laws Craftsman (Poulin) starts, idles, can take some throttle but when you hit the throttle wide open it quits. It quits with no chudding, spitting or spattering, almost like someone turned off the ignition. Any ideas? Is it possible that that it is just a carb adjustment? It is brand new. Well, he bought it 1 year ago and decided to use it now. Any Help is appreciated.
Logjam5: Don I received an email from Mowers4y regarding the tool:
We can no longer sell the carburetor adjusting tools to anyone who does not have a repair shop -- unfortunately the EPA put forth new regulations in 2012 which make it illegal for anyone to purchase them who does not have a shop.
Could I purchase one from you?
Alan in Alberta
Logjam5: I have a Walborrow carb and it the timing screws have no slots. I wasn't able to find the site you mentioned for the tool; could you spell the link out please Donny, as this saw dies=-out as soon as it gets any gas.
Juan Fernando Gonzalez Martin: Thanks a lot!!! When I adjust the carburator I take off the spade and the chain, that is quite more safe. During the fine adjust y adjust it with everything.
Wayne Ylen: I just finished solving my problem by adjusting the Hi carb screw out another full turn to allow more fuel to enter at full throttle. It's now about 2-1/2 turns out from fully seated and saw runs pretty well. The above video says very little about the Hi carb screw adjustment and could be improved by addressing this issue.
Wayne Ylen: My Poulan chain saw model PP3516AVX is about 5 years old and I only used for short jobs once or twice per year. It has a Zema Carb and using about 1-1/2 turns out from fully closed Hi and Lo carb adjustment, it will run and start ok but when throttle is increased to where secondary throttle plate opens, it will stall out. It will run fairly fast up to this point and had decent power, but acts like it's starved for fuel at full throttle and dies. Any Advice?
2cyclemix: Any idea what rpm the idle should be?
Matthew Brogneri: Followed Donyboys's guide to tune the L and H (and earlier to tear it down, check it and rebuild it), load tested it and its running the same as before! Carb bolt mounting problem is contributing a bit, but will be gone once I get the CS-8000 bolts and nuts. The guides are great! Thanks for the help!
Matthew Brogneri: I fixed it! It was the Walbro HDA268 carb non-replaceable jet. I followed someone elses fix with the same problem on the same saw, purchased a new HDA203 carb which is basically the same carb with the fuel inlet and choke rods in a different place for less than half the price. I had to re-route my fuel line for clearance, and reuse the old choke rod since it was positioned for the CS-600P choke linkage. After a few pulls, it idled and ran fine.
les4lifepaul: See if letting in less air makes it run any better by moving the choke to different positions. If it runs better with the choke partially closed, it is starved for fuel.
les4lifepaul: Not sure I understand why you replaced the piston ring. If it was damaged that points to a different set of problems, I have also encountered 2 stroke carburetors that no matter what I did like rebuild blow out all the ports and still refused to work and had to be replaced.Try running with the choke in different positions and make a note of weather it got worse or better, Check ignition as in good spark. Wish I could tell you more, hard to diagnose when I can't see what it is doing.
donyboy73: check compression
Matthew Brogneri: I have longer carb mounting bolts and nuts (which go to the CS-8000) coming since one mounting thread is stripped in the rear handle assembly which is probably causing an air leak between the carb and intake boot. Rear handle assembly which includes the gas tank, is like a $65 part alone. The HDA268 carb has a semi-fixed jet (non-replaceable), so if you start having my problem, you'll likely need a $115 new carb. The Echo CS-600P is a beast, but its expensive if something goes bad.
Matthew Brogneri: Thanks for your responses. Rebuilt the hda268 carb with new kit, which didn't help. Removed all rubber hoses to check for cracks which there weren't any, then replaced. Replaced the fuel filter. Removed the top end engine to make sure it was worth fixing, then replaced piston ring and replaced with a new gasket. Had it running briefly under throttle without the muffler, but it refused idle.
les4lifepaul: Also, 2 stroke engines love to flood. As soon as the engine gurgles even a little when starting it cold, take the choke to half way. 2 or 3 pulls with the choke on when it shouldn't be will flood it and keep it from starting. Sorry if you already knew all this, just suggesting problems I see the most often.
les4lifepaul: 99.999999% of the time when a 2 stroke, or any small engine for that matter, won't run or runs crapty the problem is fuel, and it is usually not enough of it. If it seems to run even slightly better with some choke it might be trash in the carb. You said you cleaned up the carb-not sure if you disassembled it completely but you should. One tiny speck of trash can reek havoc so blow all the ports out w/compressed air and don't expect to see the trash it will be too small.
les4lifepaul: Yes you want to turn them all the way in, then start backing them off equally until the saw starts then you can fine tune it for power and idle. A little bit goes a long way when turning the screws so I only move them 1/4 turn at a time, and even less than that once it starts. Takes some time and practice, but it is far from rocket science.
wersuss: thanks for this video
larry butler: i tried that with my mack but it still boggs out
Matthew Brogneri: Donyboy, I have a 1.5 year old Echo CS-600p which I have used somewhere between 10-15 tanks of gas. I always use 93 octane with echo's oil mix, then drain it after I'm done with it. Last week it refused to start. Mixed up some new gas, and it ran very erratically before stalling. I cleaned up the carb (which was encased with dust), its burps a bit, then runs for a short time with bad idle then stalls. There is good compression and no scoring in the cylinder or piston. Any idea what it could be?
MrBrycecox: Yeah ive done this long long ago, but its fine i did it again. It has very little (its hard to even feel it with my finger nail)
donyboy73: check piston for scoring through muffler port even though it has compression
MrBrycecox: Donyboy ive cleaned my carb, checked my fuel lines, ive got awesome compression, and great spark now why on earth will my saw not start ima bout to fip my hair out!! help help help. oh and its a McCulloch(old old shool one, but im proud of it) Thanks
DonCocos2d: thanks donyboy, I followed your steps and now my Craftsman chainsaw is working great! new fuel lines and adjusted the carb....
DonCocos2d: hi donyboy, I have a craftsman chainsaw which has the same carb as the one shown here... when you started to adust the carb did you turn both L and H to the right until it stops and than start adjustment with 1 1/4 turn out? plz help.. .thanks
donyboy73: you're welcome
BobsonofZeus: Thank you!
gemmashane: Thank you your video helped me fix my chainsaw it runs better than you keep up the good work
Matthew Shelton: Got a question bout my p3516pr chainsaw
dfnordon361: You're right, so I did go ahead and continued my search and found it on Amazon. There were only a couple left so I ordered it right away. Thanks anyway for your help.
donyboy73: actually these tools are getting hard to find, try amazon
Frank Cronin: Great Job
dfnordon361: I couldn't understand you when you gave the name of the website where we can purchase one of those screwdrivers. Could you give me the name of the website address again? Sure would appreciate it.
donyboy73: a lion, not a kitten..lol
Ross Mettner: Awesome tutorial! I followed your advise and within 30 min I had my poulan 1800 purring like a lion. Those little carbs sure are finicky! Even a 1/8 turn on the L threw mine out of adjustment.
francislavoie85: Try turning the H screw back half a turn at a time this should adjust the high rev speed
nathan zeimet: I have a Poulan wild thing chain saw 18 in. with a 40cc engine and it will only start and run briefly with the choke 7/8th of the way on any help will be great thanks.
modelshidden2: i have a 460 husqvarna and its got alot of power, but when it gets past a regular rpm, it revs high then sputters and dies, i have to choke it to start it again, but it runs good after that. it does it again and again
solarsynapse: Old Poulan Wood Shark has adjustments. How do you adjust on the new ones that don't have screws? It won't idle.
cglarsen26: Can I adjust the carb on a Farmhand 2900 using this technique? It won't idle and has lost power despite new spark plug, cleaning air filter, etc. Great video, thanks.
donyboy73: start at 2 turns out then go from there, often these saws get low on compression and are very hard to adjust
yellowbearblew: Mcculloch timber bear 60013414 walbro carb it revs in the highs for about 15 seconds and bogs let it idle for a couple seconds an itll do it again an again whats the carb setting on these