Installing The Crankcase Cover; Checking The Cylinders And Pistons - Yamaha EH63 Service Manual

PISTONS, CAMSHAFT, CRANKCASE, AND CRANKSHAFT
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INSTALLING THE CRANKCASE COVER

1.
1
10
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5
2 7
10

CHECKING THE CYLINDERS AND PISTONS

1.
2.
TIP
Measure the warpage on the contact surface of the cylin-
der head at six points using a straight edge and thickness
gauge.
3.
Install:
• Crankcase cover
• Crankcase cover bolts "1"–"10"
Crankcase cover bolt:
25 N·m (2.5 kgf·m, 18 lb·ft)
Check:
• Piston wall
• Cylinder wall
Vertical scratches  Replace the cylinder, and
replace the piston and piston rings as a set.
Measure:
• Cylinder warpage
Thickness gauge:
90890-03268
Feeler gauge set:
YU-26900-9
Warpage limit:
0.1 mm (0.0039 in)
Out of specification  Replace the crankcase
assembly.
Measure:
• Piston-to-cylinder clearance
a. Measure the cylinder bore "C" with the cylinder
bore gauge.
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