Saw wont run more than 10 seconds

[Wood Doctor]

Replace the carb because it's shot unless TheWizard hit the nail on the head in post #20. Try his solution first. Sometimes that's called a carb strainer. I have done that many times with success. If clogged, the engine will start and run for awhile and then shut down. Just MHO (and his).

 

[drf256]

Can be nozzle check valve. That will allow air to enter wet side during idle instead of it pulling fuel. Doubt it though, as your wet side gets fuel.

That should not cause it to stall if you squeeze the trigger.

Your metering area is filling with fuel and then running out. Can be tank vent, filter, line, impulse, pump diaphragm, screen, needle, seat, spring or lever. Any of the above.

 

[countryhog]

check the fine mesh filter in the carb, even if you think it looks clean, take it out and change or at least clean

cleaned the mesh filter with carb cleaner, both sides, when cleaning carb. thanks

 

[countryhog]

Ok. BIG duh here. Been rebuilding saw carbs for over 20 years. Dont know how or why i installed the fuel pump gasket against the carb with the diaphragm on top but just shows to go ya that things need to go where they sposed to. i can only guess thats how it was when i got it and i just followed what i saw. Definitely feel like a DA but extremely glad its fixed. Now it can move down the road. Much thanks to all for trying to help me. Yall rock

 

[pbillyi69]

so it was impulse related....it happens to the best of us.

 

[TheWizard]

Ok. BIG duh here. Been rebuilding saw carbs for over 20 years. Dont know how or why i installed the fuel pump gasket against the carb with the diaphragm on top but just shows to go ya that things need to go where they sposed to. i can only guess thats how it was when i got it and i just followed what i saw. Definitely feel like a DA but extremely glad its fixed. Now it can move down the road. Much thanks to all for trying to help me. Yall rock

Its easy to do and I would bet everyone on here has done that at some time, I'm not ashamed to hold my hands up and say I have in the past. Even experts in every field has to check and I'm being honest here, how many times have we said to ourselves we check something and it's still wrong I'm glad pilots get it right most of the time. Stay safe

 

[lumbersystem]

My 2050 pioneer did that=: The verdict: The cylinder polished to a mirror.
The second problem comes from the carburetor diaphragm -it let air mix with the fuel causing it to pump
fuel on choke, but not on idle.
=
[1] Clean the entire carb in ammonia.
[2] Check for cracks in the tank/body casing area.
[3] Rinse the carb out in warm water --do not do this if you have no way to dry the inside out. This includes step 1.
[4] Disassemble the cylnder to check for dammage (polishing) and replace if neccessary.
[5] Reassemble engine and carb with new diaphragm (follow instructions listed in the workshop manual)
and check metering needle and float.
[6] Don't worry if it doesn't start - at least you narrowed down the fault areas.