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Adjust the choke or carburetor. In case your chainsaw stalls when the engine is idling, ensure that the choke is set properly. To do so, first try releasing it to adjust it, and then move the plate and tighten all screws once again. To loosen any grit, spray carburetor cleaner spray on the choke's shaft. The carburetor may also need to be adjusted; consult your owner's manual which will guide you on resetting the idle mix screw.
Generally this is a fuel / air ratio problem. Usually it can be solved by a carb adjustment.
On the carb there are usually two screws, one marked low or L , the other marked high or H.
Low is your adjustment for idle mixture, high is for mixture at full throttle. The saw should
Always be adjusted to run well during the cut. Make adjustments a little at a time, then try
The saw. Continue small adjustments untill the saw is performing well at full throttle while
The chain is driven by a gear.remove the cover of the chain,while the saw is idle,the chain is probably slipping off of the drive gear causing the chain to "lockdown",if this is your problem,that gear will have to be replaced.Any small engine repair shop in your neighborhood can perform this task for you.
unleaded fuel is notorious for going stale,and it can leave a resinous coating in the carb-try running the saw on half choke with new gas and less oil eg 50 to 1 for say ten minutes,this should clear the gunk out-if this does not work,you have two choices-strip and clean the carb,or adjust the H (high) scew on the carb anti-clockwise by a quarter turn a time till it revs out full bore-good idea to remove the chain and wear ear defenders when adjusting-and always use a chainsaw at its max rpm,or you run the risk of "kickback"
First check the air cleaner. Clean or replace it. You need to set the mixtures for the carburetor. You will find a Low and High adjustment screw usually on the left or right side of the carburetor on the outside of the housing. At idle turn the screw in or clockwise until the rps starts to decrease. Then start turning it out till you hit max idle rpms. Turn screw back in a quarter to half turn and it should be idling smoothly. Be careful here and get someone to hold saw if necessary but hold in throttle to full speed and do the same with high adjustment screw. turn it in till rpm starts to drop then back it out until you get to max rpm and it won't go any higher then turn it back in a half a turn. After adjusting the mixture it might be necessary to readjust the idle speed.
The H is for when your cutting,it keeps the saw from stalling. The L, is for the saw when at Idle. When the L ,is adjusted right, the saw should stay running ,and the chain should not move ,that is with the break in the off position. The H screw,should be adjusted if the saw bogs down when rev ed up. A good starting point for theses screws would be a turn and one half out.