Replace if necessary.
2. Check camshaft run out. Replace if necessary.
Roundness limit: 0.03mm
Intake camshaft 27.596~27.696mm
Height
Exhaust camshaft 27.616~27.716mm
Base circle diameter 23.950~24.050mm
3. Check main journal diameter of camshaft and journal inside diameter of cylinder cover. Replace if
necessary.
Journal inside diameter of cylinder cover: 35.000~35.012mm
Main journal diameter: 34.935~34.955mm
4. Check the automatic decompression device for crack and damage. Replace the camshaft if
necessary.
Oil pump check
1. Remove screw and oil pump.
2. Check rotor clearance of oil pump. Replace if out of specification.
Valve guide bush replacement
1. Knock out the valve guide bush from the direction of combustion room.
2. Knock in the new valve guide bush from the direction of the top of cylinder cover.
Clearance between external rotor and casing
a
0.100~0.150 mm
Clearance between external rotor and
internal rotor b
0.040~0.140 mm
Clearance between rotor and cover c 0.030~0.090 mm
a
b
c
NOTE:
Coat the oil on the surface of pipe before installation.
3. Bore the inside diameter of pipe to the prescribed value by reamer.
Inside diameter of valve pipe: 5.500～5.512mm
NOTE:
When taking out the reamer, don’t rotate it in counter clockwise direction.
Valve seat inspection
1. Clean the carbon on the valve.
2. Coat a thin layer of bluing dye evenly onto the seal face of the valve seat.
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