Valve Spring Inspection; Valve Inspection - Yamaha VX110 Sport Service Manual

POWR
VALVES AND VALVE SPRINGS

Valve spring inspection

1. Measure:
• Valve spring free length a
Out of specification → Replace the
valve spring.
Valve spring free length:
Intake valve spring:
38.90 mm (1.53 in)
Exhaust valve spring:
40.67 mm (1.60 in)
2. Measure:
• Valve spring tilt a
Out of specification → Replace the
valve spring.
Valve spring tilt limit:
Intake valve spring:
2.5°/1.7 mm (0.067 in)
Exhaust valve spring:
2.5°/1.8 mm (0.071 in)

Valve inspection

1. Eliminate:
• Carbon deposits
(from the valve face and valve seat)
2. Check:
• Valve face
Pitting/wear → Replace the valve.
3. Measure:
• Valve margin thickness a
Out of specification → Replace the
valve.
Valve margin thickness:
0.85–1.15 mm (0.0335–0.0453 in)
5-62
E