MAINTENANCE AND REPAIR INSTRUCTIONS
•This task should be performed inside, in a clean, dust free area.
1.Remove the muffler cover by pressing down on the corner with a flat blade screwdriver (Fig. 42). Slide the notches on the sides of the muffler cover over the tabs on the engine cover and remove.
2.Remove the two (2) screws on top of the engine cover with a
3.Remove the screw on back of the engine cover (Fig. 44).
4.Disconnect the spark plug wire.
5.Clean dirt from around the spark plug. Remove the spark plug from the cylinder head by turning a 5/8 in. socket counterclockwise.
6.Remove the engine cover.
7.Clean dirt from around the rocker arm cover. Remove the screw holding the rocker arm cover with a large flat blade screwdriver or Torx T25 bit
(Fig. 45). Remove the rocker arm cover and gasket.
8.Pull the starter rope slowly to bring the piston to the top of its travel, (known as top dead center). Check that:
•The piston is at the top of its travel while looking in the spark plug hole (Fig. 45).
•Both rocker arms move freely, and both valves are closed.
If not, repeat step 8.
9.Slide the feeler gauge between the rocker arm and the valve return spring. Measure the clearance between the valve stem and rocker arm (Fig 46). Do both intake and exhaust valves.
The recommended clearance for both intake and exhaust is .076 - 0.152 mm (0.003
10.If the clearance is not within specification:
a.Turn the adjusting nut using a 5/16 inch wrench or nut driver (Fig. 46).
•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: A rocker arm cover gasket can be purchased from your local authorized dealer.
12.Reinstall the engine cover. Check alignment of the cover before tightening the screws. Tighten screws.
13.Reinstall the muffler cover. Slip the rear tab on the muffler cover into the engine cover rear slot. Then slide the remaining slots into the tabs until they snap into place (Fig. 42).
14.Check the spark plug and reinstall. See Replacing the Spark Plug.
15.Replace the spark plug wire.
REPLACING THE SPARK PLUG
Use only genuine replacement spark plugs. The correct air gap is 0.655mm (0.025 in). Remove the plug after every 25 hours of operation and check its condition.
1.Stop the engine and allow it to cool. Grasp the plug wire firmly and pull the cap from the spark plug.
2.Clean dirt from around the spark plug. Remove the spark plug from the cylinder head by turning a 5/8 in. socket counterclockwise.
3.Replace cracked, fouled or dirty spark plug. Set the air gap at 0.655 mm (0.025 in) using a feeler gauge (Fig. 48).
4.Install a correctly gapped spark plug in the cylinder head. Tighten by turning the 5/8 in. socket clockwise until snug.
If using a torque wrench torque to;
SPARK ARRESTOR MAINTENANCE
1.Remove the muffler cover. See Rocker Arm Clearance.
2.With a flat blade screwdriver or Torx T20 bit, remove the screw attaching the spark arrestor cover to the muffler (Fig. 49).
3.Pull the tab on the spark arrestor cover out of the muffler. Remove the spark arrestor cover.
4.Remove the spark arrestor screen from the spark arrestor cover.
5.Clean the spark arrestor screen with a wire brush, or replace.
6.Reinstall the spark arrestor screen, spark arrestor cover, and screw.
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