Piston Pin Inspection - Yamaha VX110 Sport Service Manual

POWR
CONNECTING RODS AND PISTONS

Piston pin inspection

The following procedure applies to all of the
piston pins.
1. Check:
• Piston pin
Bluediscoloration/grooves → Replace
the piston pin and then check the lubri-
cation system.
2. Measure:
• Piston pin outside diameter a
Out of specification → Replace the pis-
ton pin.
Piston pin outside diameter:
16.991–17.000 mm
(0.6689–0.6693 in)
<Limit>: 16.98 mm (0.67 in)
3. Measure:
• Piston pin bore diameter (in the piston)
b
Out of specification → Replace the pis-
ton.
Piston pin bore diameter
(in the piston):
17.002–17.013 mm
(0.6694–0.6698 in)
4. Calculate:
• Piston-pin-to-piston clearance
Out of specification → Replace the pis-
ton pin.
Piston-pin-to-piston clearance =
Piston pin bore diameter (in the piston)
b – Piston pin outside diameter a
Piston-pin-to-piston clearance:
0.002–0.022 mm
(0.0001–0.0009 in)
5-86
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