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3. Loosen the rocker arm jam nut. Using an allen wrench to turn
the pivot ball stud, check the clearance between the rocker
arm and the valve stem with a flat feeler gauge (Figure 11).
Figure 11 — Adjusting Valve to Rocker Arm Clearance
4. When the valve clearance is correct, hold the pivot ball stud
with the allen wrench and tighten the rocker arm jam nut.
Torque the jam nut to 7.15-9.35 N-m (65-85 in-lb). After
tightening the jam nut, recheck the valve clearance to make
sure it did not change (see Figure 11).
5. Reinstall the rocker cover gasket, rocker cover and
the four (4) screws (see Figure 10).
Tighten Jam Nut to
65-85 inch-pounds
Allen Wrench
Feeler Gauge
Loosen Jam Nut,
GGeenneerraacc GGNN--119900//222200 EEnnggiinnee
— 11 —
CARBURETOR ADJUSTMENTS
The carburetor of your engine is pre-set at the factory. The
carburetor should not be tampered with because this will VOID
THE EMISSION CONTROL SYSTEM WARRANTY. If you
experience problems and your engine is used at an altitude in
excess of 5000 feet, contact the nearest authorized dealer
regarding high altitude setting changes.
CHECKING/ADJUSTING VALVE TO
ROCKER ARM CLEARANCE
Every 50 hours of operation, remove the rocker cover and
check the valve to rocker arm clearance.
When adjusting the clearance, the engine should be at room
temperature, and the piston should be at Top Dead Center
(TDC) of its compression stroke (both valves are closed). The
correct clearance is 0.05-0.1mm (0.002-0.004 in.). Check and
adjust the valve to rocker arm clearance as follows:
1. Remove the four (4) screws from the rocker cover
(Figure 10).
2. Remove the rocker cover and rocker cover gasket.
Figure 10 —Removing the Valve Cover
OHVI
LOW
OI