KYMCO KXR 250, Service Manual

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8
. CYLINDER/PISTON
8-6
Mongoose/KXR 250
Measure the piston pin O.D.
Service Limit : 16.96mm replace if below
Measure the piston O.D.
Service Limit : 72.6mm 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 : 72.8mm 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 : 0.05mm repair or replace
if over
Cylindricity : 0.05mm repair or replace if
over
Take measurement at 10mm from the
bottom and 90
°
to the piston pin hole.
＊
10 mm