Sym PA12B Service Manual page 119

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8. Cylinder / Piston
Cylinder Inspection
Check if the inner diameter of cylinder is worn
Exhaust side Inlet side
out or damaged.
Measure the cylinder inner diameter in X and
Top
Y axis at three levels.
Service limit：37.50 mm
Center
Calculate the taper and out of round at three
levels in X and Y axis. Take the maximum
Bottom
value to determine.
Service limit：
Out of round：0.05 mm
Taper：0.05 mm
Measure the cylinder upper surface for
warpage.
Service limit：0.05mm
8-4