Cylinder Inspection; Piston Inspection; Service Points - Yamaha F15A Service Manual

POWR
D
a
CRANKCASE AND CRANKSHAFT
D
1
D
2
D and D
1 2
D and D
3 4
D and D
5 6
d

SERVICE POINTS

Cylinder inspection

1. Measure:
9 Cylinder bore
Out of specification → Rebore or
replace the cylinder.
NOTE:
Measure the cylinder bore in parallel and
at a right angle to the crankshaft. Then,
average the measurements.
Cylinder 59.00 ~ 59.02 mm
bore "D" (2.323 ~ 2.324 in)
Taper
limit "T"
Out of
round limit
D = Maximum Dia. (D
T = (maximum D
or D )
6

Piston inspection

1. Measure:
9 Piston diameter
Out of specification → Replace the
piston.
Distance
Standard
(0.20 in) (2.3206 ~ 2.3215 in)
Oversize piston diameter:
*Oversize 1 : 59.25 mm (2.333 in)
Oversize 2 : 59.50 mm (2.343 in)
*Except for USA
2. Measure:
9 Piston pin boss inside diameter
Out of specification → Replace.
Pistonpin boss inside diameter:
14.004 ~ 14.015 mm
(0.5513 ~0.5518 in)
5-38
Standard
59.10 mm
—
—
~D )
1 6
or D ) ~ (minimum D
1 2
Piston diameter d
a
5 mm 58.950 ~ 58.965 mm
E
Wear limit
(2.327 in)
0.08 mm
(0.003 in)
0.05 mm
(0.002 in)
5