Sym Wolf SB 250 Ni Service Manual page 137

Measure the outer diameter of piston pin.
Caution
Measure the piston outer diameter in the

direction perpendicular to the piston pin
axis.
Service limit: 70.38 mm
Compare the measured value with service
limit to calculate the clearance between the
piston and cylinder.
Measure piston ring thickness.
Service limit: 1.46mm
8. Cylinder / Piston
8-7