ATV 250 Service Manual page 167

3)Install
.Circlip ¢Ù(new)
.Valve guide pipe ¢Ú(new)
Use the installing and disassembling device of
valve guide pipe
4)Ream the inner diameter of valve guide pipe
to get proper valve rod clearance.
Caution
Regrind the valve race after installing valve
guide pipe
4.Valve race
1).Clean
.Carbon deposit(valve raue and value face)
2)Check
.Valve seat ring
Regrind the valve if it is exfoliation corroded.
3)Measure
.Contacting width of valve and valve race.
Regrind the valve race if unqualified.
.Paint red lead powder on the valve fit pyra-
midal foce of valve race
.Place the valve into the cylinder cover.
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