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Idle ports may be plugged or blocked - This is the small ports in the carburetor where the fuel passes through when in idle. ... Vent in the Fuel Cap is plugged - If the vents in the fuel caps are clogged the fuel becomes vacuum locked. ... Starting with the High Speed screw, turn it ...
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https://www.youtube.com/watch?v=aIUVQziXBPY
Jul 7, 2011 - Uploaded by BriggsRepair
Is this Craftsman 16" chainsaw broken? Hardly. Watch this carburetor fix and how it runs brand new!
There is no fixed carburetor setting on these engines, just two screws to adjust low-end and high-end operation. Special tool may be required, there are about a half-dozen screw head standards. Check eBay for tool. Get the engine to run and idle fast (idle adjust) so it doesn't stall, adjust low-end screw so that engine doesn't hesitate or sputter when accelerated. Adjust high-end screw to run fast and smooth on full throtle. Readjust idle to normal.
Try turning the "L" needle 1/8 CCW If no better try 3/16 CW. The "L" is primarily smoothness at idle and acceleration. Carburetor Adjustment by Madsens.com http://www.madsens1.com/saw%20carb%20tune.htm
CW is leaner; to lean will destroy the saw. If over tightened closed (CW) the adjustment screw faces are easily marred; marred adjustments are difficult to impossible to set properly.
Clean the air filter; adjusting with a dirty filter can cause a run lean condition once cleaned and the saw run.
Clean the spark arrestor and muffler; if the saw cannot exhale it cannot inhale.
There are 2 wav (sound - idle & full - may not be highlighted) files that I find most helpful, I think you will too.
If you have more questions or need additional help please reply below and I will get back to you. Thank you for using FixYa and Good Luck. HTH Lou
Duplicate Post
There is usually a sticker with a craftsman Model Number on it, often "358.Something". That number can be used to find an IPL and if you are lucky an OM here: Sears PartsDirecthttp://www.searspartsdirect.com/partsdirect/index.action Start at 1.5 CCW from lightly seated then tune for performance like this: Carburetor Adjustment by Madsens.com http://www.madsens1.com/saw%20carb%20tune.htm CW is leaner; to lean will destroy the saw. If over tightened closed (CW) the adjustment screw faces are easily marred; marred adjustments are difficult to impossible to set properly. Clean the air filter; adjusting with a dirty filter can cause a run lean condition once cleaned and the saw run. There are 2 wav (sound - idle & full – may not be highlighted) files that I find most helpful, I think you will too. HTH Lou Duplicate Answer
Check the condition of the fuel line and filter in the tank and to the carb and primer.Today gas and time will soften them allowing them to become blocked or leak.Replace if needed.
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