Engine rpm should be checked with an accurate tachometer.
Low and high idle rpm can be adjusted by removing the cover at the rear of the governor, and turning the high idle and low idle adjusting screws. Turning either adjusting screw in a clockwise direction will decrease the respective high and low idle rpm. The retainer holes in the cover are shaped to prevent the screws from turning, after the adjustment has been made.
1. Cover. 2. Retainer holes (two). 3. High idle adjusting screw. 4. Low idle adjusting screw.
After setting the idle rpm, move the governor control lever to change the engine rpm. Return it to the idle position and recheck the idle rpm. Repeat the adjustment procedure until the specified idle rpm is obtained.