PIAGGIO MSS ZIP 100 4T - Inspecting the cylinder

- Calculate the piston pin coupling clearance.
Fitting clearance
Pin coupling clearance 13 +0.010+0.005mm 0.005 ÷
0.014 mm
- Measure the outside diameter of the piston, perpendicular to the gudgeon pin axis.
- Carry out the measurement at 27 from the piston crown as shown in the figure.
Inspecting the cylinder
- Using a bore meter, measure the inner cylinder
diameter at three different points according to the
directions shown in the figure.
- Check that the coupling surface with the head is
not worn or misshapen.
- Pistons and cylinders are classified into catego-
ries based on their diameter. The coupling is car-
ried out in pairs (A-A, B-B, C-C, D-D).
Characteristic
Maximum allowable run-out:
0.05 mm
MSS ZIP 100 4T Engine
ENG - 91