Yamaha VMX12 2001 Service Manual page 145

CAMSHAFTS
b. First, install the exhaust camshaft, and then
the intake camshaft.
NOTE:
@
• Be sure to install the camshafts in the correct
place as shown.
"IN" mark = intake camshaft
"EX" mark = exhaust camshaft
• Make sure the timing marks 6 (o: small
hole) in the camshaft face up.
• Be sure to keep the timing chain as tight as
possible on the exhaust side.
• Remove the wire from the timing chain.
@
CAUTION:
@
Do not turn the camshaft, as damage could
occur to the pistons and valves.
@
c. Install intake and exhaust camshaft caps
#1, #3, and finally #4.
NOTE:
@
At this point, do not install intake camshaft cap
#2, exhaust camshaft cap #2, and the timing
chain guide (top side).
@
d. Align the mark a on the camshaft with the
mark b camshaft cap.
NOTE:
@
Cylinder #1 is at TDC when the small hole in
the camshaft is aligned with the camshaft cap
mark.
@
e. Lubricate the camshaft cap bolts with
engine oil.
f. Tighten the camshaft cap bolts.
NOTE:
@
• The camshaft caps are numbered from right
to left.
• First, tighten intake and exhaust camshaft
cap bolts #3, #1, and finally #4.
• Tighten the camshaft cap bolts in stages and
in a crisscross pattern, working from the
inner caps out.
@
4 - 15
ENG