Once the engine is warm, do several high-speed runs to confirm that the high-speed needle is set correctly.

Bring the vehicle in and pinch closed the fuel line going into the carburetor.The engine should run for 2-3 seconds, speed up, and then die.

If the engine runs longer than 3 seconds, then lean the low-speed needle 1/16 turn, make several more highspeed runs, and retest.

If the engine dies immediately without speeding up, then richen the low-speed needle 1/8 turn, make several more high-speed runs, and retest.