7-9. Adjusting Overspeed Shutdown Valve
OFF
YStop engine, and let cool.
The overspeed shutdown valve protects the engine from damage
10 9 8
2
3
RUN
START
due to high engine speed. If the en- gine stops, the valve may be closed.
Shutdown speed is between 1950 and 2100 rpm. Use a tachometer to check shutdown speed as follows:
Open right side door and remove rear panel.
1Air Cleaner
2Hose Into Air Cleaner
3Hose Clamp
Loosen clamp and remove hose.
4Plastic Cap
5High Speed Stop Screw
6Lock Nut
1
Engine End
Drawing #
7
6 | 5 | 4 |
Tools Needed:
3/8 in
Remove plastic cap from screw. Loosen nut. Turn screw out (toward front of engine) several turns.
7Speed Control Lever
8Overspeed Shutdown Valve
Start engine and increase speed by moving lever toward high speed stop screw. Note engine rpm when valve closes and stops engine.
If shutdown speed is not between 1950 and 2100 rpm, adjust as follows:
9Lock Nut
10Valve Adjustment Screw
Loosen nut and turn screw one turn (clockwise to increase and counter- clockwise to decrease shutdown rpm). Tighten nut.
Check shutdown speed and repeat adjustment if needed.
YStop engine.
Turn high speed stop screw in until screw touches lever. Tighten lock nut on screw and reinstall plastic cap.
Install hose and hose clamp. Install rear panel and close side door.
If necessary, adjust engine speed according to Section
