Checking The Piston Pins And Small-End Bearings; Checking The Piston Rings - Yamaha Z200N Service Manual

POWR
CYLINDER BODY ASSEMBLY
5460
5470
CHECKING THE PISTON PINS AND
SMALL-END BEARINGS
1. Check:
• Piston pin
• Small-end bearing
Heat discoloration → Replace.
Damage/scratches → Replace.
2. Measure:
• Piston pin diameter
(with a micrometer)
Out of specification → Replace.
Piston pin diameter
23.065 - 23.070 mm
(0.9081 - 0.9083 in)
3. Measure:
• Piston pin boss diameter
(with a micrometer)
Out of specification → Replace.
Piston pin boss diameter
23.074 - 23.085 mm
(0.9084 - 0.9089 in)

CHECKING THE PISTON RINGS

NOTE:
• Before checking the piston rings, be sure
to check the cylinder body.
• Piston rings should always be replaced as
a set (per piston).
5-58
E
5
5