Piston Pin - Yamaha YBR 125 Service Manual

Che ck and repair
Piston measurement
1. Measure:
Measure diameter of skirt section of piston with micr-
ometer at the point 5mm to bottom edge of piston.
Outer diameter standard of piston:
Clearance between piston and cylinder
Inner dia-
meter of
cylinder
Exceeding specified value→Replacement

Piston pin

1.Check:
Piston pin
Blueing or becoming groove→Replacing, then checking
lubrication system.
2.Measure:
Outer diameter a of piston pin
Exceeding specified value range→Replacing
Outer diameter of piston pin:
14.991 15.000 mm
Limitation:14.969 mm
4 - 27
ENG
53.997 54.029 mm
Outer dia-
meter of
=
Clearance
piston