MAINTENANCE & REPAIR INSTRUCTIONS
1. Loosen the four (4) screws shown in Figure 27.
Engine
Cover 
Remove
Screws
Loosen
Screws
FIGURE 27
2.Remove the three (3) screws that secure the engine cover, visible in Figures 27 and 28.
3.Disconnect the spark plug wire.
4.Remove the spark plug.
5.Remove the engine cover.
Remove Screw
Back of Engine
FIGURE 28
6.Clean dirt from around the rocker arm cover. Then remove the screw holding the rocker arm cover with a large flat blade screwdriver or Torx T25 bit. Remove the rocker arm cover and gasket. See Figure 29.
Rocker Arm Cover
Spark Plug
Hole
FIGURE 29
7.Pull the starter rope slowly to bring the piston to the top of its travel, (known as top dead center). Check that:
•While looking in the spark plug hole, the piston is at the top of its travel. See Figure 29.
•Both rocker arms move freely, and both valves are closed.
If not, repeat this step.
8.Slide the feeler gauge between the rocker arm and the valve return spring. Measure the clearance between the valve stem and rocker arm. Measure both the intake and exhaust valves. See Figure 30.
The recommended clearance for both intake and exhaust is .076 – 0.152 mm (.003
Rocker Arm | Adjusting Nut |
| |
| Feeler |
Gasket | Gauge |
FIGURE 30 
10. | specification: |
a. Turn | a 5/16 inch (8 mm) |
wrench or nut driver. | Figure 30. |
•To increase clearance, turn the adjusting nut counterclockwise.
•To decrease clearance, turn the adjusting nut clockwise.
b.Recheck both clearances, and adjust as necessary.
11.Reinstall the rocker arm cover using a new gasket. Torque the screw to
NOTE: You can purchase a rocker arm cover gasket from your local authorized dealer.
12.Reinstall the engine cover. Check alignment of the cover before tightening the screws. Tighten screws.
14.Check the spark plug and reinstall. Refer to Replacing the Spark Plug.
15.Replace the spark plug wire.
20