Piston Outer Diameter Measurement; Inner Diameter Measurement Of The Piston Pin Hole - PGO PMX Sport 50 Service Manual

4.Piston outer diameter measurement:

(1)Measure at the skirt area where is 12 mm from the
skirt lower end.
(2)Limit of use: change if when below
51.905mm(110cc)
(3)Calculate the clearance between cylinder and piston.
Limit of use:change it when over 0.100mm

5.Inner diameter measurement of the piston pin hole

Limit of use: change it when over 14.032mm(110cc)