Yamaha XVS6501997, Service Manual

Page: 136 / 327

4-32
CYLINDERS AND PISTONS
ENG
*****************************************************
*****************************************************
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