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KINROAD 150 SERVICE MANUAL
CYLINDER
CYLINDER REMOVAL
The removal can be done on the vehicle body.
Remove cylinder head.
Remove cylinder.
Remove cylinder gasket, bolts.
Erase cylinder gasket.
1. Do not damage the bond area of the cylinder.
Do not drop sundries, such as cylinder gasket material into the crankcase.
2.
CYLINDER INNER WALL WEAR INSPECTION
Use a bore diameter dial gauge to measure the degree of wear.
The measuring point is divided into three
sectional planes in the axial direction: upper,
middle, lower; measure every plane each
time on the mutually perpendicular directions
(X, Y). The least measured dimension is the
cylinder bore; the data measured at the most
upper position is the largest diameter, and
the lower position is the smallest diameter. At the same cross section, measure the difference of diameter
between two points mutually perpendicular, which is the circularity of the cylinder.
In order to make the measuring point perpendicular with the bore axis of the cylinder,
and to ensure the precision of the measurement, the bar of the gauge can be slightly
swung in the direction of the gauge bar, and take the smallest reading number as the
result.
In the situation without a dial gauge, a feeler gauge can be used to make relativity measurement. Put a new
piston into the cylinder, and use the feeler gauge to measure the gap between the piston skirt and the
cylinder wall, and then figure out the abrasion loss of the cylinder.
If the circularity of the cylinder exceeds the limit, a cylinder-reboring machine should be used to re-bore the
3. ENIGNE
13
VERSION 1, DEC., 2005
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