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Removing the oil seal housing
1. Remove the oil seal housing 1.
1
Removing the crankcase
1. Remove the crankcase bolts in the
sequence shown.
NOTE:
Insert a flat-head screw driver between the
pry tabs to pry off the crankcase.
69D5G11
Removing the crankshaft assembly
1. Remove the crankshaft assembly and oil
seal housing.
69D50350
Checking the cylinder bore
1. Measure the cylinder bore (D
measuring points a, b, and c, and in
direction d (D
to the crankshaft, and direction e (D
D
4
crankshaft.
69D50330
a: 10.0 mm (0.39 in) from the cylinder head top
69D50340
surface
b: 5.0 mm (0.20 in) above the exhaust port
upper edge
c: 5.0 mm (0.20 in) below the scavenging port
lower edge
, D
, D
), which is parallel
1
3
5
, D
), which is at a right angle to the
6
Cylinder bore diameter (D
72.000 — 72.020mm
(2.8346 — 2.8354 in)
Cylinder gauge 1:
90890-06759
Crankcase
1
2
3
4
69D50360
— D
) at
1
6
5
,
2
6
7
8
9
— D
):
1
6
5-32
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