Checking The Camshafts - Yamaha VMX12 2001 Service Manual

CAMSHAFTS
7. Remove:
• timing chain guide (exhaust side)
• camshaft caps 1
• dowel pins
NOTE:
@
For reference during installation, put identifica-
tion marks on each camshaft cap.
@
CAUTION:
@
To prevent damage to the cylinder head,
camshafts or camshaft caps, loosen the
camshaft cap bolts in stages and in a criss-
cross pattern, working from the outside in.
@
8. Remove:
• camshafts
NOTE:
@
To prevent the timing chain from falling into the
crankcase, fasten it with a wire 1.
@
9. 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.
Camshaft lobe dimension limit
Intake camshaft
a 36.15 mm
b 27.92 mm
Exhaust camshaft
a 36.15 mm
b 27.92 mm
4 - 11
ENG