Baja WD250U Service Manual page 165

• Paint molybdenum disulfide oil on the valve
rod part.
• Place the valve in to the cylinder cover
• Rotate the valve to grind in with seat fully on
the valve face, then clean the dirt
• Repeat procedure until the contacting width
of valve face and valve seat
CAUTION:
In order to get the best grinding quality, you
may slap the valve lightly when rotating the
valve forward and backward. Be sure to clean
all the dirt on the valve face and valve race
after every grinding.
6) Measure the contacting width again after
correcting and grinding
• Measure the contacting width and
position of valve and valve race again
according to method explained in 3)
• If the contacting width and position do not
conform to specification yet, recorrect and
grind the valve race
5. Valve spring
1) Measure
• If the free length (a) (inner and outer spring)
of valve spring is unqualified, replace it.
Free length of valve spring
Inner spring Outer spring
(intake/exhaust) (intake/exhaust)
35.5mm(1.4 in) 37.2mm(1.46in)
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