Cylinder Inspection - Sym EuroMX 125 Service Manual

7. Cylinder/Piston
Cover the holes of crankcase and cam chain with
a piece of cloth.
Clean up all residues or foreign materials from
the two matching surfaces of cylinder and
crankcase.
Caution
To soap the residues into solvent so that the
residues can be removed more easily.

Cylinder Inspection

Check if the inner diameter of cylinder is worn
out or damaged.
In the 3 positions (top, center and bottom) of
cylinder, measure the X and Y direction values
respective in the cylinder.
Service limit: 52.50 mm
Calculate both the real roundness (the difference
between X and Y motion values) and the
cylindrical roundness (the difference in the top,
center or bottom positions of X or Y motion
values.) Then, determinate by the max. value.
Service limit:
Real roundness: correct or replace as over
0.05 mm
Cylindrical roundness: correct or replace as
over 0.05 mm
Check Cylinder Wrapage.
Service limit: correct or replace as over 0.05
mm
7-4
This Chapter Contents
Exhaust side Intake side
Top
Center
Bottom