Yamaha YFM700RV 2009 Service Manual page 177

VALVES AND VALVE SPRINGS
2. Replace:
NOTE:
_
To ease valve guide removal and installation,
and to maintain the correct fit, heat the cylinder
head to 100 °C (212 °F) in an oven.
M
a. Remove the valve guide with the valve
b. Install the new valve guide with the valve
c. After installing the valve guide, bore the
L
NOTE:
_
After replacing the valve guide, reface the
valve seat.
3. Check:
4. Measure:
4 - 27
• valve guide
MMM M MMM M M MMM M M MMM
guide remover 1.
guide remover 1 and valve guide installer
2.
valve guide with the valve guide reamer 3
to obtain the proper stem-to-guide clear-
ance.
Valve guide remover (ø6)
90890-04064
Valve guide remover (6.0 mm)
YM-04064-A
Valve guide installer (ø6)
90890-04065
Valve guide installer (6.0 mm)
YM-04065-A
Valve guide reamer (ø6)
90890-04066
Valve guide reamer (6.0 mm)
YM-04066
LLL L LLL L L LLL L L LLL
• valve face
Pitting/wear → Grind the face.
• valve stem end
Mushroom shape or diameter larger than
the body of the valve stem → Replace.
• margin thickness a
Out of specification → Replace.
Margin thickness
0.80 ~ 1.20 mm
(0.0315 ~ 0.0472 in)
ENG
M M MMM M M MMM M
L L LLL L L LLL L
MMM
LLL