4. Measure the valve stem runout. If exceeding the limit, replace the valve.
Valve stem runout limit: 0.03mm
5. Measure the inner diameter of the valve pipe.
The inner diameter of the valve pipe: 5.500
～
5.512mm
CAUTION:
When replacing the valve, please use the new valve pipe and valve oil seal.
Valve spring
1. Measure the free length of valve spring. If less than prescribed value, replace.
The minimum free length: 34mm
2. Measure the valve spring tilt. If exceeding the prescribed limit, replace.
The maximum tilt limit: 1.2mm
Valve rocker arm
Check the rocker arm for crack, perforation or damage. Replace if necessary.
Valve pipe replacement
1. Knock out the valve pipe from the direction of combustion room.
2. Knock in the new valve pipe from the direction of the top of cylinder cover.
NOTE:
Coat the oil on the surface of pipe before installation.
3. Bore the inner diameter of pipe to the prescribed value by reamer.
Inner 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.
3. Lap the valve on valve seat by valve lapping tool.
4. Measure the valve seat width.
The valve face is with bluing dye.
If the valve and valve seat do not match, or the valve seat width does not conform to specified
value, reface and lap the valve seat.
If the contact surface is not even, replace the valve pipe.
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