1-S28
L3130 · L3430 · L3830 · L4630 · L5030, WSM
ENGINE
Top Clearance
1. Remove the cylinder head.
2. Move the piston up and stick a strip of fuse on the piston head at
three position with grease.
3. Lower the piston and install the cylinder head. (Use a new
cylinder head gasket and tighten with a specified tightening
torque.)
4. Turn the flywheel until the piston passes through the T.D.C..
5. Remove the cylinder head and measure the thickness of the
fuses.
6. If the measurement is not within the factory specifications, check
the oil clearances between the crankpin and bearing and
between the piston pin and bushing.
W1020190
(2) Disassembling and Assembling
(A) Cylinder Head and Valves
Cylinder Head Cover
1. Remove the lead (1).
2. Remove the breather hose (2).
3. Remove the head cover screws (3).
4. Remove the cylinder head cover (4).
(When reassembling)
• Check to see if the cylinder head cover gasket is not defective.
W1060460
Top clearance Factory spec.
0.55 to 0.70 mm
0.0217 to 0.0276 in.
Tightening torque Cylinder head screws
93.1 to 98.0 N·m
9.5 to 10.0 kgf·m
68.7 to 72.3 ft-lbs
(1) Piston (2) Fuse
Tightening torque Cylinder head cover screw
6.9 to 11.3 N·m
0.7 to 1.15 kgf·m
5.1 to 8.32 ft-lbs
(1) Lead
(2) Breather Hose
(3) Head Cover Screw
(4) Cylinder Head Cover
(5) Cylinder Head Cover Gasket
(6) Breather Valve
(7) Plate
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