Yamaha TW200 Service Manual page 101

INSPECTION AND REPAIR
1
ENG
1\, . .
1
2. Inspect:
-Valve stem end
Mushroom shapel Larger diameter than rest
of stem--+Replace valve, valve guide, and oil
seal.
NOTE: _
Deburr any deformed valve stem end. Use an
stone to smooth the stem end.
CD
Deburr
~
Valve
302-003
3. Clean the valve face to remove carbon
deposits.
4. Inspect:
-Valve face
Pitting/Wear--+ Grind the face.
5. Measure:
- Margin thickness
®
Out of specification --+ Replace.
[][]------
Margin Thickness Limit:
0.7 mm (0.028 in)
/ /
302-004
4-21
6. Check:
-Valve stem end
Mushroom shape or diameter larger than rest
or stem--+Replace.
eRunout
Out of specification --+ Replace.
Maximum Valve Stem Runout:
0.01 mm (0.0004 in)