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What is the best way to adjust a chain saw carburetor?

Updated:21-06-2021
The accuracy of the adjustment of the chain saw carburetor often affects the performance of the chain saw, such as power, emissions, and overturning. The following will introduce how to correctly use the tachometer to adjust the carburetor of the chain saw, and make it match the best match with the chain saw: (tool: tachometer, special screwdriver for chain saw)

1. Warm up the engine for 3 minutes, adjust the H needle to make the engine speed at high speed between 11200~11500rpm;
2. Adjust the L needle to the highest idle speed point (the highest idle speed point of the domestic 45/58 chain saw is usually 4900-5100rpm, if it exceeds or falls below 4900-5100rpm, directly adjust the T needle to 4900-5100rpm);
3. After confirming that the highest point of idle speed is 4900~5100rpm, return the L needle counterclockwise to about 2000rpm, so that the idle speed is 2900~3100rpm;
4. Increase the throttle to the maximum, release the throttle after about 5 seconds, fine-tune the T needle to ensure that the idling speed is 3000~3200rpm;
5. Increase the throttle to the maximum, adjust the H needle so that the high-speed speed is 11200~11500rpm, and continue to feed oil for 30 seconds to 1 minute;
6. Release the throttle and refuel, fine-tune the H needle to confirm that the high-speed speed can be stabilized at 11200~11500rpm;
7. After ensuring that the idle speed is 3000~3200rpm, turn the engine up, down, left, and right 90 degrees to not stall.
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