Mini Screw
July 24th, 2009
Tuning a mini bike carb with 2 screws?
I have a H35 tecumseh engine, and the carb has 2 screws for adjustment. Techinally theres 3 but i know the one that pushes on the throttle is for tuning idle. But there is one below that on the side, and one under the bowl of the carb. What is the best way to tune these?
The screw under the carb bowl is the drain screw - keep it tightly closed (clockwise).
The other screw is the idle mixture screw.
Turn the mixture screw in (clockwise) until it is lightly seated, then back it out (counter clockwise) 1 & 1/2 turns.
Run the engine and adjust the idle screw to get the engine running comfortably at idle speed without struggling to stay running.
Turn the mixture screw in and out to get the engine idling as fast as it will go using the mixture screw.
Then turn the mixture screw in (clockwise) 1/4 turn.
Re-adjust the idle screw.
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