kymco mo bw250 Instruction De Maintenance

Measure the piston pin O.D.
Service Limit: 16.96mm replace if below

Measure the piston O.D.

Service Limit: 72.60mm 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: 72.80mm repair or replace if

Over

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: 0.09mm repair or replace

if over

 Cylindricity: 0.09mm repair or replace if over

• Take measurement at 9mm from the

bottom and 90° to the piston pin hole.

＊

Middle

Bottom

Top