If the chainsaw won’t start and you’re confident that everything else is in good condition except the carburetor adjustments, you can try the following baseline carburetor settings to help get it started:
Low-Speed (L) and High-Speed (H) Screws:
A common starting point is to turn both the low-speed (L) and high-speed (H) screws 1 to 1.5 turns out from fully closed.
This initial setting provides enough fuel flow to start the engine.
Idle (T or I) Screw:
Set the idle screw so that the throttle valve is opened around 1 to 1.5 millimeters as a starting point.
If it still won’t start, try opening the idle screw a bit further, as this can sometimes help get enough air/fuel mixture to start the saw.
Attempt to Start:
Try to start the chainsaw. If it starts but won’t stay running, slowly adjust the L screw (low-speed mixture) to achieve a steady idle.
Fine-tune the T or I screw (idle speed) to keep the engine idling without engaging the chain.
Once it’s idling, you can make further adjustments to both the low-speed (L) and high-speed (H) screws to get optimal performance.
