8. Maintenance
WAY OF THE COOLING AIR
• This engine is air-cooled. Dust clogging between the
inlet port of the cooling air and cylinder fins will cause
overheating of the engine. Periodically check and
clean the cylinder fins after removing the air cleaner
and the cylinder cover.
SPARK PLUG
• Starting failure and misfiring are often caused by a
fouled spark plug. Clean the spark plug and check
that the plug gap is in the correct range. For a re-
placement plug, use the correct type.
0.6~0.7 mm
IMPORTANT
• Note that using any spark plug other than those des-
ignated may result in the engine failing to operate prop-
erly or in the engine becoming overheated and dam-
aged.
• To install the spark plug, first turn the plug until it is
finger tight, then tighten it a quarter turn more with a
socket wrench.
TIGHTENING TORQUE:
GEAR CASE
• Supply multi-purpose grease at every 50 hours of use.
1. Use a grease pump.
2. Feed grease until it comes out of the base of blades.
14.7–21.5 N·m
(a) Grease nipple: A type
ADJUSTING CARBURETOR
The carburetor has been adjusted at the factory. Should
your unit need readjustment due to the changes in alti-
tude or operating conditions, please let your skillful dealer
make the adjustment. A wrong adjustment may cause
damage to your unit.
ADJUSTING THROTTLE CABLE
• The normal play is 1 or 2 mm when measured at the
carburetor side end. Readjust with the cable adjuster
as required and tighten the screw up.
(3)
(2)
GB 13
(1) Idle adjusting screw
(2) Up
(3) Down
(4) Fuel adjusting screw
(Opening 1 ± 1/4)
(5) Decrease
(6) Increase
(1) Cable adjuster
(2) 0.04in (1~2mm)
(1)
(3) Screw