Zenoah EHT602D Owner's Manual page 14

eHT752S / eHT602D
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 specified by
ZENOAH.
0.6~0.7 mm
• REPLACEMENT PLUG IS A CHAMPION RCJ6Y or
NGK BPMR7A.
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.
GB-14
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.
THROTTLE WIRE PLAY
Throttle wire play should be 1~2 mm. After completely
returning the throttle lever, take the throttle wire at the
carburetor end in your fingers and give a light tug. If the
play is too great or too small, readjust the position of the
wire retaining nut. Loosen the lock nut and turn the wire
retaining nut clockwise (screw in) to increase the play
and counter-clockwise (unscrew) to reduce it. After ad-
justing, please fasten the wire retaining nut by tighten-
ing the lock nut.
(1) Idle adjusting screw
(2) Up
(3) Down
(4) Fuel adjusting screw
(Opening 1 ± 1/4)
(5) Decrease
(6) Increase
a. lock nut
b. wire retaining nut
c. wire sleeve