KINROAD 150 SERVICE MANUAL VERSION 1, DEC., 2005
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cylinder, and to enlarge its diameter by 0.50mm or 1.00mm, then fit the piston and piston ring whose sizes
are also enlarged. If the wear is too severe and cannot be reworked, a new cylinder should be installed.
Cylinder bore
57.4mm
Cylindricity 0.05mm
Circularity 0.05mm
CRANK CONNECTING ROD MECHANISM
PISTON SET
PISTON PIN INSPECTION AND SERVICING
Insert the piston pin horizontally into the pinhole of piston, and inspect the clearance between piston and
piston pin.
If the free play is too much, the worn condition of piston pin and the pinhole of piston must be inspected
respectively.
Measuring the external diameter of piston pin.
If the result is less than service limit, it should be replaced.
After replacement, the clearance between piston pin and the pinhole of piston must comply with the
requirement.
Measure the inner diameter of piston pin.
If the result is more than service limit, it should be replaced.
After replacement, the clearance between the pinhole of piston and piston pin must be sure to comply with
the requirement.
PISTON RINGS INSPECTION AND SERVICING
Inspect if there is a flaw, serious wear, or serious conglutination on the piston ring. If there is, it should be
replace.
If the piston ring’s lateral clearance and notch clearance are too large or too small, malfunction may be
caused. So it must be measured.
Measure the clearance of piston ring in the piston ring groove. This clearance is the piston ring’s lateral
Service limit
0.02 mm
Service limit
14.96 mm
Service limit
15.04 mm
