Yamaha YZ426F, Owner'S Service Manual

Page: 288 / 633

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ENG
CAMSHAFTS
Timing chain tensioner
1. Check:
●
While pressing the tensioner rod lightly
with fingers, use a thin screwdriver
1
and wind the tensioner rod up fully
clockwise.
●
When releasing the screwdriver by
pressing lightly with fingers, make sure
that the tensioner rod will come out
smoothly.
●
If not, replace the tensioner assembly.
ASSEMBLY AND INSTALLATION
1. Install:
●
Exhaust camshaft 1
●
Intake camshaft
2
Installation steps:
●
Turn the crankshaft counterclockwise until
the “I” mark
a
on the rotor is aligned with
the stationary pointer
b
on the crankcase
cover.
●
Fit the timing chain 3 onto both camshaft
sprockets and install the camshafts on the
cylinder head.
NOTE:
The camshafts should be installed onto the
cylinder head so that the exhaust cam
sprocket punch mark
c
and the intake cam
sprocket punch mark
d
align with the sur-
face of the cylinder head.
CAUTION:
Do not turn the crankshaft during the
camshaft installation. Damage or
improper valve timing will result.