Yamaha YZF-R1PC Utility Trailer User Manual


 
5 - 26
ENG
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.
Valve guide remover
Intake (4.0 mm, 0.16 in)
90890-04111
Exhaust (4.5 mm, 0.18 in)
YM-4116
Valve guide installer
Intake (4.0 mm, 0.16 in)
90890-04112
Exhaust (4.5 mm, 0.18 in)
YM-4117
Valve guide reamer
Intake (4.0 mm, 0.16 in)
90890-04113
Exhaust (4.5 mm, 0.18 in)
YM-4118
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.
Valve margin thickness
0.5 ~ 0.9 mm (0.0197 ~ 0.0354 in)
Valve stem runout
0.01 mm (0.0004 in)