8. CYLINDER/PISTON
8-8
Measure the piston pin O.D.
Service Limit: 12.96 mm (0.5184 in)
Measure the piston O.D.
Service Limit:
90cc/70cc: 46.9 mm (1.876 in)
50cc-4T: 38.9 mm (1.556 in)
Measure the piston-to-piston pin clearance.
Service Limit: 0.02 mm (0.008 in)
CYLINDER INSPECTION
Inspect the cylinder bore for wear or damage.
Measure the cylinder I.D. at three levels of
top, middle and bottom at 90° to the piston
pin (in both X and Y directions).
Cylinder I.D.:
Service Limit:
90cc/70cc: 47.1 mm (1.884 in)
50cc-4T: 39.1 mm (1.564 in)
Measure the cylinder-to-piston clearance.
Service Limit: 0.1 mm (0.004 in)
The true roundness is the difference
between the values measured in X and Y
directions. The cylindricity (difference
between the values measured at the three
levels) is subject to the maximum value
calculated.
Service Limits:
True Roundness: 0.05 mm (0.002 in)
Cylindricity: 0.05 mm (0.002 in)
4 m
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