Yamaha XP500 Service Manual page 354

VALVES AND VALVE SPRINGS
M
a. Remove the valve guide with a valve guide
b. Install the new valve guide with a valve
c. After installing the valve guide, bore the
NOTE:
After replacing the valve guide, reface the
valve seat.
L
3. Eliminate:
4. Check:
5. Measure:
5 - 23
MMM M MMM M M MMM M M MMM
remover 1.
guide installer 2 and valve guide remover
1.
valve guide with a valve guide reamer 3 to
obtain the proper valve-stem-to-valve-guide
clearance.
Valve guide remover (4 mm)
90890-04111, YM-04111
Valve guide installer (4 mm)
90890-04112, YM-04112
Valve guide reamer (4 mm)
90890-04113, YM-04113
LLL L LLL L L LLL L L LLL
• carbon deposits
(from the valve face and valve seat)
• valve face
Pitting/wear → Grind the valve face.
• valve stem end
Mushroom shape or diameter larger than
the body of the valve stem → Replace the
valve.
• valve margin thickness a
Out of specification → Replace the valve.
Valve margin thickness
0.6 ~ 0.8 mm (0.0236 ~ 0.0315 in)
<Limit>: 0.5 mm (0.0197 in)
ENG
M M MMM M M MMM M
L L LLL L L LLL L
MMM
LLL