Yamaha WR450F Fahrer- Und Wartungshandbuch Seite 374

1
3
6. Remove:
2
• Clips
• Exhaust camshaft 1
• Intake camshaft 2
NOTE:
Attach a wire 3 to the timing chain to prevent
it from falling into the crankcase.
INSPECTION
Camshaft
1. Inspect:
• Cam lobes
2. Measure:
• Cam lobes length a and b
3. Measure:
• Runout (camshaft)
4 - 27
CAMSHAFTS
Pitting/scratches/blue discoloration →
Replace.
Out of specification → Replace.
Cam lobes length:
Intake:
a 30.100 ~ 30.200 mm
(1.1850 ~ 1.1890 in)
<Limit>: 30.000 mm
(1.1811 in)
b 22.450 ~ 22.550 mm
(0.8839 ~ 0.8878 in)
<Limit>: 22.350 mm
(0.8799 in)
Exhaust:
a 30.200 ~ 30.300 mm
(1.1890 ~ 1.1929 in)
<Limit>: 30.100 mm
(1.1850 in)
b 22.450 ~ 22.550 mm
(0.8839 ~ 0.8878 in)
<Limit>: 22.350 mm
(0.8799 in)
Out of specification → Replace.
Runout (camshaft):
Less than 0.03 mm (0.0012 in)
ENG