Yamaha SX500D Supplementary Service Manual page 58

a
b
CYLINDER HEAD AND CYLINDER
3. Measure:
S Outside diameter a (piston pin)
4. Measure:
S Piston pin-to-piston clearance
Piston pin-to-piston clearance =
5. Inspect:
S Reed valves 1
6. Measure:
S Valve stopper height a
7. Measure:
S Reed valve bending limit a
–54–
Out of specification ! Replace the piston
pin.
Outside diameter a (piston pin):
19.995 X 20.000 mm
(0.7872 X 0.7874 in)
Out of specification ! Replace the piston.
Bore size (piston pin) b –
Outside diameter (piston pin) a
Piston pin-to-piston clearance =
0.004 X 0.020 mm
(0.00016 X 0.0008 in)
Bends/cracks/damage ! Replace.
Out of specification ! Replace the valve
stopper.
Valve stopper height a :
10.4 X 10.8 mm (0.41 X 0.42 in)
Out of specification ! Replace the reed
valve.
Reed valve bending limit a :
less than 0.3 mm (0.012 in)
ENG