Checking The Piston Pin Diameter; Checking The Connecting Rod Small End Inside Diameter And Big End Inside Diameter; Checking The Connecting Rod Big End Side Clearance - Yamaha F225F Service Manual

a
Piston pin boss inside diameter a:
22.011–22.018 mm
(0.8666–0.8668 in)
TIP:
When measuring the piston pin boss inside
diameter, do not measure it at the ring groove
b or oil groove c.

Checking the piston pin diameter

1. Measure the piston pin diameter a.
a
Piston pin outside diameter a:
21.996–22.005 mm
(0.8660–0.8663 in)
Checking the connecting rod small
end inside diameter and big end
inside diameter
1. Tighten the bolts a to the specified
torques in 2 stages.
2. Measure the connecting rod small end
inside diameter a and big end inside
diameter b.
b
c c
c
90˚
b
a
Connecting rod small end inside
diameter a:
22.010–22.024 mm
(0.8665–0.8671 in)
Connecting rod big end inside diameter b:
55.990–56.010 mm
(2.2043–2.2051 in)
Connecting rod bolt a:
1st: 40 N·m (4.0 kgf·m, 29.5 ft·lb)
2nd: 90°
TIP:
• When checking the oil clearance, reuse the
removed connecting rod bolt.
• In the second tightening stage for the con-
necting rod bolts a, mark the connecting
rod bolts and the connecting rod cap with
identification marks c, and then tighten the
bolts 90° from the marks on the connecting
rod cap.
Checking the connecting rod big end
side clearance
1. Measure the connecting rod big end side
clearance a.
Cylinder block
a
0
1
2
3
4
5
6
7
8
9
10
A
7-80