46
MAINTENANCE
SPARK PLUG
SPARK PLUG
The spark plug should be removed and examined
periodically. Replace worn, fouled or damaged
spark plug.
• Remove spark plug and inspect condition.
• Set spark plug gap on new, replacement spark
plug.
• Apply Electrical Grease to the ribbed portion of
the spark plug ceramic and to the opening of
the spark plug cover to prevent corrosion.
Recommended spark plug and gap setting:
• NGK CR6HSA @ 0.026 in. (0.65 mm).
Tighten spark plug 8 ft. lbs. (11 N·m).
VALVE CLEARANCE
Measurement
Remove engine cover.
Remove recoil starter. Refer to starter REMOVAL
on p. 141.
Remove spark plug.
Remove four screws and cylinder head cover.
Rotate the flywheel clockwise to bring the piston
to Top Dead Center (TDC) on compression
stroke.
IMPORTANT: Rotate the crankshaft in the nor-
mal running direction only (clockwise) to prevent
water pump impeller damage.
To confirm whether the piston is at the TDC posi-
tion on a compression stroke or on a exhaust
stroke, rotate the flywheel within ±15° beyond the
TDC position:
• If both rocker arms do not move at all, the piston
is at the position on a compression stroke.
• If any rocker arm moves, the piston is at the
TDC position on an exhaust stroke. Rotate the
flywheel one more turn.
IMPORTANT: The piston must be at its TDC
position on a compression stroke to check or
adjust valve clearance.
005895
1. Screw (4)
2. Cylinder head cover
005896
1
2
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