Checking The Camshafts - Yamaha YFZ450S 2003 Service Manual

1
3
6. Remove:
2
• exhaust camshaft 1
• intake camshaft 2
• clips
NOTE:
To prevent the timing chain from falling into the
crankcase, fasten it with a wire 3.

CHECKING THE CAMSHAFTS

1. Check:
• camshaft lobes
Pitting/scratches/blue discoloration →
Replace the camshaft.
2. Measure:
• camshaft lobe dimensions a and b
Out of specification → Replace the cam-
shaft.
3. Measure:
• camshaft runout
Out of specification → Replace.
4 - 12
CAMSHAFTS
Camshaft lobe dimensions
Intake
a 31.200 ~ 31.300 mm
(1.2283 ~ 1.2323 in)
<Limit>: 31.100 mm
(1.2244 in)
b 22.550 ~ 22.650 mm
(0.8878 ~ 0.8917 in)
<Limit>: 22.450 mm
(0.8839 in)
Exhaust
a 30.950 ~ 31.050 mm
(1.2185 ~ 1.2224 in)
<Limit>: 30.850 mm
(1.2146 in)
b 22.494 ~ 22.594 mm
(0.8856 ~ 0.8895 in)
<Limit>: 22.394 mm
(0.8817 in)
Camshaft runout limit
0.03 mm (0.0012 in)
ENG