Valve Spring - Yamaha ttr230 Service Manual

a
INSPECTION AND REPAIR
5. Measure:
• Thickness a
Out of specification => Replace.
6. Measure:
• Warping (valve stem)
Out of specification => Replace.
NOTE:
• Replace the guide and retainers whenever
the valve is replaced.

VALVE SPRING

1. Measure:
• Free length a
Out of specification => Replace.
Intake
Exhaust
4-31
ENGINE
Thickness:
0.8-1.2 mm (0.031 ~ 0.047 in)
Warping:
Less than 0.010 mm
Spring free length:
Internal
36.17 mm
36.17 mm
External
36.63 mm
36.63 mm