KYMCO VITALITY 50 Manual page 122

7. CYLINDER HEAD (2-STROKE)/
CYLINDER/PISTON
Measure the piston O.D.
Take measurement at 4.5mm from the
bottom and 90° to the piston pin hole.
Service Limit: 38.9mm replace if below
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.:
Service Limit: 39.1mm replace if over
Measure the cylinder-to-piston clearance.
Service Limit: 0.1mm repair or replace if
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
Cylindricity: 0.05mm repair or replace if
over
over
if over
4.5mm
VITALITY 50
7-16