With engine running, move speed control lever to maximum speed position. Use an accurate tachometer
to determine no-load speed of engine.
Do not overspeed the engine.
Loosen locknut and adjust maximum speed adjusting screw until required no-load speed is obtained.
Hold adjusting screw and tighten locknut.
If maximum no-load speed is raised or lowered more than 50 rpm by installation or removal of
governor shims, governor gap must be readjusted.
Hold high-speed spring retainer and tighten locknut.
Idle Speed Adjustment. After maximum no-load speed has been set, adjust the idle speed as follows:
Place stop lever in RUN position and speed control lever in IDLE position.
Start engine and allow to warm up to normal operating temperature.
Back out buffer screw to avoid contact with the differential lever.
Loosen buffer screw locknut and turn idle speed adjusting screw until engine is operating at approximately
15 rpm below the recommended idle speed.
The recommended idle speed is 500 to 600 rpm.
Buffer Screw Adjustment.
After adjusting idle speed to 15 rpm below recommended speed, loosen buffer-screw locknut and turn
buffer screw in until it just comes in contact with differential lever while still eliminating engine roll.
Do not increase engine idle speed more than 15 rpm with buffer screw.
Recheck maximum no-load speed. If it has increased more than 25 rpm from maximum speed attained in
para c, back off buffer screw until increase is less than 25 rpm.
Hold buffer screw and tighten buffer screw locknut.