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1
1
2. Move equipment speed control to idle
position.
3. Turn idle screw to obtain 1750 RPM
minimum.
4. Then turn idle mixture screw clockwise
slowly until engine begins to slow.
5. Then turn screw opposite direction until
engine just begins to slow.
6. Then turn screw back to midpoint (Figure
39).
Figure 39
7. Install limiter cap (if equipped) on idle
mixture screw (Figure 40).
Figure 40
8. Move equipment speed control from idle to
high speed position.
9. Engine should accelerate smoothly. If it
doesn’t, open idle mixture screw 1/8 turn
open.
Adjust Valve Clearance
All Models - Except Vertical Models 110000,
120000 Early Production
NOTE: Check valve clearance while the engine
is cold.
1. Turn crankshaft counterclockwise until
piston is at top dead center on the
compression stroke. This prevents the
compression release from holding the
valves open.
2. Insert a narrow screwdriver or rod into the
spark plug hole as a gauge, then slowly
turn crankshaft counterclockwise until the
piston has moved down the bore by 1/4”
(6mm).
3. Using a feeler gauge (A, Figure 41), adjust
rocker nut to obtain the clearance as listed
in Section 12 - Engine Specifications.
4. Hold rocker nut and tighten the rocker ball
setscrew (B) to the torque valve shown in
Section 12 - Engine Specifications.
5. Check clearance again and re-adjust, if
necessary.
6. Repeat for other valve.
NOTE: On some models, the nut and setscrew
are positioned above the push rod ends.
Figure 41