1-S26
ZD18(F) · ZD21(F) · ZD28(F), WSM
ENGINE
Top Clearance
1. Remove the cylinder head. (Do not attempt to remove the
cylinder head gasket.)
2. Move the piston up, and stick a strip of fuse [1.5 mm dia. (0.059
in. dia.), 5 to 7 mm long (0.197 to 0.276 in. long)] on the piston
head at three positions with grease so as to avoid the intake and
exhaust valves and the combustion chamber ports.
3. Lower the piston, and install the cylinder head and tighten the
cylinder head screws to the specified torque.
4. Turn the crankshaft until the piston exceeds its top dead center.
5. Remove the cylinder head, and measure the thickness of the
squeezed fuses.
6. If the measurement is not within the factory specifications, check
the oil clearance between the crankpin and crankpin bearing and
between the piston pin and small end bushing.
NOTE
• After checking the top clearance, be sure to assemble the
cylinder head with a new cylinder head gasket.
W10107670
Top clearance
Factory
spec.
D722
D782
0.50 to 0.70 mm
0.0197 to 0.0276 in.
D1105
0.55 to 0.70 mm
0.0217 to 0.276 in.
Tightening
torque
Cylinder head screw
D722
D782
37.2 to 42.1 N·m
3.8 to 4.3 kgf·m
28.0 to 31.7 ft-lbs
D1105
63.7 to 68.6 N·m
6.5 to 7.0 kgf·m
47.0 to 50.6 ft-lbs
(1) Fuse
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