Maruyama MCV31R, Owner'S/Operator'S Manual

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— US-38 —
Spark Plug Maintenance
1. With the engine at ambient (room) temperature, twists
the high tension lead boot on the spark plug back and
forth a couple of times to loosen the boot, and then pull
the boot off of the spark plug.
2. Remove the spark plug.
3. Clean the electrodes with a stiff brush.
4. Adjust the electrode air gap to 0.6-0.7 mm (0.024-0.028
in).
5. Replace the spark plug if it is oil-fouled, damaged, or if
the electrodes are worn down.
6. Do not over tighten the spark plug when installing. The
tightening torque is 10.7-16.6 N·m (95-148 in. lbs).
SPROCKET
Maintenance Interval
• The sprocket should be cleaned and inspected for dam-
age after each 25 hours of operation, or when you
install new chain.
SPROCKET CLEANING AND INSPECTED
• The clutch should be cleaned and inspected for damage.
• The damaged sprocket will premature damage or wear
of saw chain.
• When the sprocket has worn out 0.5mm or more,
replace it.
SPARK PLUG
Maintenance Interval
• The spark plug should be removed from the engine and checked after each 25 hours of operation.
• Replace the spark plug after every 100 hours of operation.
Spark plug
0.6 - 0.7 mm
TIPS
0.5 mm
(0.024 - 0.028 inches)
SPROCKET
PITCH TEETH
3/8 6