Carburetor Adjustment - Zenoah G300PUM Owner's Manual

8. Carburetor Adjustment

The carburetor is provided with 3 adjust screws they may need a little adjustment
depending on the temperature, atmospheric pressure (altitude), etc. of the area
where the engine is used. Start the engine without making any adjustments. Make
readjustments only when the engine shows any mal-running.
High Speed needle Low Speed needle
Idle Screw
Standard opening of each needle as follows;
H L
5 1 1 1
1 / ± / 1 / ± /
8 4 8 4
9