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Re: chainsaw well not stay running
Start with a new sparkplug, then check the gasket on the carb. The bolts that hold the carb on should be tightened equally. If it is a very old saw the crank seals could be the prob too! Hope not! Frankster016
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if it starts (maybe idles) but then dies when giving it gas it sure looks like its a carb problem , most likely dirt in the high speed jet , but could be a dirty fuel filter as well and that's inside the fuel tank
Turn mixture screws completely in gently, then wind out 11/2 turns each. The saw will be able to start and run at this point. On idle wind Low clockwise till motor starts to die then anti-clockwise 3/4 turn.
High speed is a little more difficult, On full revs wind clockwise till saw starts to rev out (lean Mixture) then back till the sound starts to bubble.
get it running on idle,adjust the idle down till it runs hairy,then adjust low speed mixture screw till you get it highest revs,then keep repeating that till you get it idling normal.rev saw up max revs,adjust high speed jet, in or out till you get max revs,then screw out one quater of a turn.That lets enough fuel thru to cool the sparkplug tip..If thats no good,redo the carbi.Check the tiny filter under the needlevalve hole.Check the needlevalve diaphragm height.recheck gaskets are right way round
Check air filter- clean or replace,
Make sure you have fresh fuel,
A new spark while you are giving it a service,
Do you know how to tune the saw?
Start with basic settings 1 turn on the low and 1 turn on the high
And adjust from there,
You might have turned the idle up too high.
The choke should always be fully in when saw is running.
Hope this is a good start
There is a low speed jet and high speed. Low speed sets the idle or stays running without feathering the throttle./// When setting high speed, hold the throttle wide open until engine revs high, then turn back in(at least ¼ turn) to slow the engine which in turn gives the engine more gas and runs cooler. If you have it too lean on the high speed, it will be hot and hard to start. Sometimes using 40 to 1 mix helps with starting, especially on older chainsaw. good luck
Make sure you are using fresh fuel mix (50:1 ratio). Don't use boat motor oil in a saw--only modern synthetics made for saws. Always premix the oil and fuel thoroughly before adding to the saw. Check the fuel filter for plugging and the condition of all fuel lines, plus the primer bulb condition. Check all carburetor fasteners for tightness. Make sure the air filter and muffler are not plugged. If still no help, you may need to service the carburetor. For an excellent article on Walbro carburetors, go to: http://www.drystacked.com Pay particular attention to the placement of the lower diaphragm and the cover gasket--interchanging positions of them cause many headaches. Adjustment of the two jet screws require a special 'D' screwdriver which may necessitate a trip to a servicing dealer for adjustment. Hope this helps!
This does take a little time to get it just right. Start at one full turn for the h and l. Work on the high first and after you get the H running work on the Low. They have to work together. So if you get it to idle and run at full throttle but it hesitates when you pull the trigger just adjust the low a little higher.