Yamaha SX500D Supplementary Service Manual page 54

CYLINDER HEAD AND CYLINDER
INSPECTION
1. Measure:
S Valve stopper height a
2. Measure:
S Reed valve bending limit a
–50–
Out of specification ! Replace.
Valve stopper height a :
10.4 X 10.8 mm (0.41 X 0.42 in)
Out of specification ! Replace.
Reed valve bending limit a :
less than 0.3 mm (0.012 in)
ENG