Checking The Camshafts - Yamaha 2004 YP400 Service Manual

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CAMSHAFTS
6. Remove:
• camshaft cap 1
• dowel pins
NOTE:
_
• Loosen the camshaft cap bolts in the
descending order of the embossed numbers
on the camshaft cap.
• Loosen each camshaft cap bolt 1/2 of a turn
at a time. After all of the camshaft cap bolts
are fully loosened, remove them.
7. Remove:
• intake camshaft 1
1
• exhaust camshaft 2
NOTE:
_
To prevent the timing chain from falling into the
2
crankcase, fasten it with a wire 3.
8. Remove:
• camshaft sprockets
EAS00204

CHECKING THE CAMSHAFTS

1. Check:
• camshaft lobes
Blue discoloration/pitting/scratches →
Replace the camshaft.
2. Measure:
• camshaft lobe dimensions a and b
Out of specification → Replace the cam-
shaft.
5 - 10
ENG
Camshaft lobe dimension limit
Intake camshaft
a 34.250 mm (1.3484 in)
b 24.850 mm (0.9783 in)
Exhaust camshaft
a 33.350 mm (1.3130 in)
b 24.856 mm (0.9786 in)