Yamaha XVS6501997 - Piston Pin Inspection

4-32
CYLINDERS AND PISTONS
ENG
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b
a
PISTON PIN INSPECTION
1. Inspect:
S Piston pin
Blue discoloration/grooves  Replace,
then inspect the lubrication system.
2. Measure:
S Piston pin-to-piston clearance
Measurement steps:
D Measure the piston pin outside diameter
a
.
If out of specification, replace the piston pin.
Outside diameter (piston pin):
19.995  20.000 mm
D Measure the piston inside diameter
b
.
D Calculate the piston pin-to-piston clearance
using the following formula:
Piston pin-to-piston clearance =
Bore size (piston pins) –
Outside diameter (piston pins)
D If out of specification, replace the piston.
Clearance (piston pin to piston):
0.004  0.020 mm