KAYO MOTOR A180, Service Manual

Page: 145 / 213

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5.Cylinder/piston
Plug the crankcase hole and cam chain hole
with a cleaning cloth.
Remove all gasket debris and foreign matter
on the joint surface of the cylinder and the crankcase.
Inspection
Check whether the inner diameter of the cylinder
is worn or damaged.
Divide the upper, middle and lower positions in
the cylinder, and measure and record the value of
the cylinder inner diameter in the X and Y axis
directions respectively.
Usable limit: 62.650mm
Calculate the roundness (the difference between the
X direction and the Y direction) and the cylindricality
(the difference between the inner diameters of the
upper, middle, and lower positions in the X or Y
direction), and the maximum value shall prevail.
NOTE
The gasket debris can be soaked with the
solution, which is easier to remove.
Exhaust side Intake side
Top
Middle