KINROAD 150 SERVICE MANUAL VERSION 1, DEC., 2005
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Remove the oil seal from the right crankcase.
CRANKSHAFT AND CRANKCASE INSPECTION
Replace the whole set of the crankshaft if serious wear is found while inspecting.
Measure the axial clearance of the big end of the connecting rod.
When measuring, make one side of the connecting rod big end close to the crank, and insert the feeler
gauge between the other side and the crank and get the correct end play.
Measure the radial (X, Y) clearance of the big end of the con’rod.
Measure the main shaft jump of the crankshaft.
If the crank jump is too much, it will cause the engine to shake abnormally, and shorten the life of the engine.
So it must be examined carefully when inspecting.
0.10mm (A = 90)
Service limit
0.10mm (B = 105)
Examine if there is any looseness, or unusual sound when the crank journal bearing turns. If there is, the
whole set should be replaced.
Inspect if the joint face of the crankcase is smooth and clean, and notice if it will affect the sealing
performance between the left and right crankcase while reassembling.
After the above inspection, use oilstone to furnish the crankcase if it has some surface damage. Replace
cover if damage is too severe.
Service limit
0.55 mm
Service limit
0.05 mm
z
The right and left crankcase axle hole must be concentric, so generally they must be replaced at
the same time.
