Spark Plug; Cylinder Cooling Fins - Maruyama H23DR Manuel D'utilisation

release the hose. While still holding on to the fuel hose, attach the new fuel filter. Drop the fuel
filter back into the fuel tank. Make sure that the fuel filter is not stuck in a corner of the tank and
that the fuel hose is not doubled over (kinked) before refueling.

SPARK PLUG

Maintenance Interval: The spark plug should be remove from the engine and checked after each
25 hours of operation and replaced after every 100 hours of operation.
Maintenance: With the engine at ambient (room) temperature,
twist the high tension lead boot on the spark plug back and forth
a couple of times to loosen boot then pull the boot off of the spark
plug. Remove the spark plug. The electrodes can be cleaned
with a stiff brush. Adjust the electrode air gap to 0.6 — 0.7 mm
(0.024 — 0.028 in.). Replace the spark plug if it is oil-fouled,
damaged or if the electrodes are worn down. Do not
overtighten the spark plug when installing. The tightening
torque is 10.7 — 16.6 Nm (95 — 148 in. lbs.). Reinstall the cylinder and muffler covers.

CYLINDER COOLING FINS

Maintenance Interval: The cylinder cooling fins should be cleaned after every 25 hours of opera-
tion or once a week which ever comes first. Air must flow freely around and through the cylinder
cooling fins to prevent engine overheating. Leaves, grass, dirt and debris buildup on the fins will
increase the operating temperature of the engine which can reduce engine performance and
short en engine life.
Maintenance: With the engine at ambient (room) temperature, remove the two socket head
screws, and remove the cover (FIG.1). Remove the two socket head screws, and remove the tail
pipe. Loosen the cylinder cover screw (knob) and lift off the cylinder cover. Clean all dirt and
debris from the cooling fins and from around the cylinder base. Reinstall the cylinder cover, tail
pipe and the cover (FIG.2).
1
English
2
｜ 19 ｜
tiPS
0.6 — 0.7 mm
(0.024" — 0.028")