Checking The Timing Chain Tensioner; Installing The Camshafts - Yamaha YFZ450S 2003 Service Manual

CAMSHAFTS
EBS00228
CHECKING THE TIMING CHAIN
TENSIONER
1. Check:
• chain tensioner rod
Damage/wear → Replace.
2. Check:
• timing chain tensioner play
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a. While pressing the tensioner rod lightly with
fingers, use a thin screwdriver 1 and wind
the tensioner rod up fully clockwise.
b. When releasing the screwdriver by pressing
lightly with fingers, make sure that the ten-
sioner rod will come out smoothly.
c. If not, replace the tensioner assembly.
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INSTALLING THE CAMSHAFTS

1. Install:
• exhaust camshaft 1
• intake camshaft 2
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a. Turn the crankshaft counterclockwise until
the "I" mark a on the rotor is aligned with
the stationary pointer b on the A.C. mag-
neto cover.
b. Fit the timing chain 3 onto both camshaft
sprockets and install the camshafts on the
b
cylinder head.
NOTE:
The camshafts should be installed onto the
a
cylinder head so that the exhaust camshaft
sprocket punch mark c and the intake cam-
shaft sprocket punch mark d align with the
mating surface of the cylinder head.
CAUTION:
Do not turn the crankshaft during the cam-
shaft installation. Damage or improper
valve timing will result.
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4 - 15
ENG
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