Removing The Camshafts - Yamaha YFZ450S 2003 Service Manual

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CAMSHAFTS

REMOVING THE CAMSHAFTS

1. Remove:
• timing mark accessing screw 1
• crankshaft end accessing screw 2
2. Align:
• "I" mark on the A.C. magneto rotor
(with stationary pointer on the A.C. magneto
cover)
M MMM M MMM M M MMM
a. Turn the crankshaft counterclockwise.
b. When the piston is at the Top Dead Center
(TDC) on the compression stroke, align the
"I" mark a on the A.C. magneto rotor with
the stationary pointer b on the A.C. mag-
neto cover.
NOTE:
• In order to be sure that the piston is at the
Top Dead Center (TDC), the punch mark c
on the exhaust camshaft sprocket and the
punch mark d on the intake camshaft
sprocket must align with the cylinder head
mating surface, as shown in the illustration.
• The Top Dead Center (TDC) on the compres-
sion stroke can be found when the camshaft
lobes are turned away from each other.
L LLL L LLL L L LLL
3. Loosen:
• tensioner cap bolt 1
4. Remove:
• timing chain tensioner 2
5. Remove:
• camshaft cap bolts 1
• camshaft caps 2
NOTE:
Remove the camshaft cap bolts in a crisscross
pattern, working from the outside in.
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.
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ENG
M M MMM M M MMM M
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M MMM M MMM
L LLL L LLL