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5-21
POWR
E
CYLINDERS
SERVICE POINTS
Cylinder inspection
1. Eliminate:
● Carbon deposits
(with a rounded scraper 1)
2. Inspect:
● Cylinder water jacket
Corrosion/mineral deposits → Clean
or replace.
● Cylinder inner surface
Score marks → Replace.
3. Measure:
● Cylinder bore “D”
(with a cylinder gauge)
Out of specification → Replace cylin-
der and piston as a set.
NOTE:
Measure the cylinder bore in parallel and at
a right angle to the crankshaft. Then, aver-
age the measurements.
Standard Limit
Cylinder
bore “D”
80.000–
80.018 mm
(3.1496–
3.1503 in)
Original cylinder
bore + 0.04 mm
(0.0016 in)
Taper “T” —
0.08 mm
(0.003 in)
Out of
round “R”
—
0.05 mm
(0.002 in)
D = Maximum (D
1
–D
6
)
T = (Maximum D
1
or D
2
) – (Maximum D
5
or D
6
)
R = (Maximum D
1
, D
3
or D
5
) – (Minimum
D
2
, D
4
or D
6
)
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