Checking The Valve Seats - Yamaha FJR1300R Service Manual

VALVES AND VALVE SPRINGS
3. Eliminate:
• carbon deposits
(from the valve face and valve seat)
4. Check:
• 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.
5. Measure:
• valve margin thickness a
Out of specification → Replace the valve.
6. Measure:
• valve stem runout
Out of specification → Replace the valve.
NOTE:
@
• When installing a new valve, always replace
the valve guide.
• If the valve is removed or replaced, always
replace the oil seal.
EAS00240

CHECKING THE VALVE SEATS

The following procedure applies to all of the
valves and valve seats.
1. Eliminate:
• carbon deposits
(from the valve face and valve seat)
2. Check:
• valve seat
Pitting/wear → Replace the cylinder head.
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ENG
Valve margin thickness
Intake : 0.8 ~ 1.2 mm
(0.0315 ~ 0.0472 in)
Exhaust : 0.5 ~ 0.9 mm
(0.0197 ~ 0.0354 in)
Valve stem runout
0.01 mm (0.0004 in)