Checking The Piston Pin; Checking The Connecting Rod Small End Inside Diameter; Checking The Connecting Rod Big End Side Clearance; Checking The Crankshaft - Yamaha F2.5A Service Manual

POWR

Checking the piston pin

1. Measure the
Replace if out of specification.
Piston pin diameter:
11.996–12.000 mm
(0.4723–0.4724 in)
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:
12.006–12.020 mm
(0.4727–0.4732 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 specifi-
cation.
5-27
Power unit
piston pin diameter.
a
S69M5650
Connecting rod big end side
clearance a:
0.2–0.6 mm (0.008–0.024 in)

Checking the crankshaft

1. Check the teeth of the crankshaft gear
for damage or wear. Replace if neces-
sary.
2. Measure the crankpin diameter a and
crankpin width b. Replace the crank-
shaft if out of specification.
a
S69M5660
S69M5670
a
S69M5680
69M3E11