Valve, Valve Guide And Valve Seat - Yamaha XC200T Service Manual

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3. Eliminate:
..... oCarbon deposit
Use rounded scraper, and wire brush.
NOTE:
Do not a sharp instrument and avoid damaging
or scratching"
oSpark plug threads
eExhaust port
oCombustion chamber
....... 4. Measure:
eCylinder head warpage
Use a Straightedge (_ and Feeler Gauge
®.
Under specification--, Resurface.
. Outer specification--, Replace.
[_ Cylinder Head Warp Limit:
Less than 0,025 rnm (0,001 in)
VALVE, VALVE GUIDE AND VALVE SEAT
__ I_- Valve Inspection
(_ 1. Eliminate:
®Carbon deposit
T_]_(_j r- Use a 400-600 grit wet sandpaper.
2. Check:
--_ I _ .Valve face (_ "_- oStem end
:_ 45° Wear/Pitting / Out of specification--, Replace.
Margin Thickness (Service limit)
(_):
intake 0.7 mrn (0,028 in)
Exhaust 0.7 mm (0.028 in)
Beveled (_): 0.50 mm (0.020 in)
Minimum Length (Service lirnit)
®:
4,0 rnrn (0,157 in)
3. Inspect:
oValve stem end
Mushroom shape/Larger diameter than rest
of stem-* Replace valve, valve guide, and oil
seal.
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