KYMCO MX 125 - Page 97

8. CYLINDER/PISTON
8-6
MX’er SYSTEM
Measure the piston pin O.D.
Service Limit: 14.96mm replace if below
Measure the piston O.D.
Piston O.D.: 61.9662mm (MX’er 150)
Piston O.D.: 56.4656.5mm (MX’er 125)
Measure the piston-to-piston pin clearance.
Service Limit: 0.02mm replace if over
CYLINDER INSPECTION
Inspect the cylinder bore for wear or damage.
Measure the cylinder I.D. at three levels of
top, middle and bottom at 90° to the piston
pin (in both X and Y directions).
Cylinder I.D.:
62.0362.045mm (MX’er
150)
56.5356.545mm (MX’er
125)
Measure the cylinder-to-piston clearance.
Service Limit: 0.1mm repair or replace if
over
The true roundness is the difference
between the values measured in X and Y
directions. The cylindricity (difference
between the values measured at the three
levels) is subject to the maximum value
calculated.
Service Limits:
True Roundness: 0.05mm repair or replace
if over
Cylindricity: 0.05mm repair or replace if
over
Take measurement at 5mm from the
bottom and 90° to the piston pin hole.

Top
Middle
Botto
m