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POWR
CYLINDER BODY ASSEMBLY
5410
5420
5430
INSPECTING THE CYLINDER BODY
1. Inspect:
• Cylinder sleeves
Cracks/score marks → Replace.
• Cylinder body water jacket
Mineral deposits/rust → Clean.
CAUTION:
Do not scratch the contacting surfaces of
the crankcase and cylinder head.
2. Inspect:
• Exhaust passages
Cracks/damage → Replace.
Carbon deposits → Clean.
CAUTION:
Do not scratch the contacting surfaces of
the cylinder and exhaust inner cover.
3. Measure:
• Cylinder bore diameter "D"
(with a cylinder bore gauge)
Out of specification → Replace.
NOTE:
Measure the cylinder bore diameter at three
positions for both D
the measurements.
Cylinder
bore diame-
ter "D"
Taper limit T
Out of round
limit R
T = (maximum D
or D
)
6
R = Maximum (D
(D
– D
)
5
6
A: 10 mm (0.4 in) below the top of the cylinder
B: 5 mm (0.2 in) above the exhaust port
C: 5 mm (0.2 in) below the scavenging port
5-52
and D
. Then, average
1
2
Standard
90.00 - 90.02 mm
90.1 mm
(3.543 - 3.544 in)
0.08 mm
—
(0.003 in)
0.05 mm
—
(0.002 in)
or D
) – (minimum D
1
2
– D
) or (D
– D
1
2
3
E
5
Wear
limit
(3.55 in)
5
) or
4
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