KYMCO Downtown 200i Service Manual page 75

7. CYLINDER/PISTON
Measure the piston pin O.D.
Service Limit: 16.8 mm replace if below
Measure the piston O.D.
Take measurement at 9mm from the bottom
and 90° to the piston pin hole.
Service Limit: 65.9mm 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).
Service Limit:
66.1 mm repair or replace if over
Measure the cylinder-to-piston clearance.
Service Limit:
0.1 mm 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: 0.05 mm repair or replace if over
7-5
DOWNTOWN 200i
Top
Middle
Bottom