Service manual

5-19
POWR
Power unit
Cylinder check
1. Eliminate the carbon deposits (using a
rounded scraper 1).
2. Check the cylinder water jacket. Clean or
replace the cylinder if there is corrosion
or mineral deposits.
3. Check the cylinder inner surface.
Replace if there are score marks.
4. Measure the cylinder bore “D” (using a
cylinder gauge). Replace the cylinder
and piston as a set if out of specification.
TIP:
Measure the cylinder bore parallel to and at a
right angle to the crankshaft. Then, average
the measurements.
Cylinder installation
1. Install the cylinder, and then tighten the
bolts to the specified torque in the order
1, 2, and so on.
Standard Limit
Cylinder bore
“D”
81.000–
81.020 mm
(3.1890–
3.1898 in)
81.100 mm
(3.1929 in)
Taper “T”—
0.080 mm
(0.0031 in)
Out of round
“R”
—
0.050 mm
(0.0020 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
)