Checking The Piston Pin Boss Bore; Checking The Piston Pin; Checking The Connecting Rod Small End Inside Diameter; Checking The Connecting Rod Big End Side Clearance - Yamaha F15B Service Manual

POWR
Piston ring side clearance:
Top ring a:
0.04–0.08 mm
(0.0016–0.0032 in)
Second ring b:
0.02–0.04 mm
(0.0008–0.0016 in)
Oil ring c:
0–0.22 mm
(0–0.0087 in)

Checking the piston pin boss bore

1. Measure the piston pin boss bore.
Replace the piston if out of specification.
Piston pin boss bore:
14.004–14.015 mm
(0.5513–0.5518 in)

Checking the piston pin

1. Measure the
Replace if out of specification.
Piston pin diameter:
13.996–14.000 mm
(0.5510–0.5512 in)
5-41
Power unit
6D451240
piston pin diameter.
6D451250
Checking the connecting rod small
end inside diameter
1. Measure the connecting rod small end
inside diameter a. Replace the connect-
ing rod if out of specification.
Connecting rod small end inside
diameter a:
14.015–14.029 mm
(0.5518–0.5523 in)
Checking the connecting rod big
end side clearance
1. Measure the connecting rod big end side
clearance a. Replace the connecting rod
or crankshaft, or both if out of specifica-
tion.
Connecting rod big end side
clearance a:
0.050–0.220 mm
(0.0020–0.0087 in)
a
6D451265
a
6D451270
6D45F11