Yamaha XT250X - Page 157

CYLINDER HEAD
5-11
d. While holding the camshafts, temporarily
tighten the camshaft sprocket bolts.
e. Remove the wire from the timing chain.
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3. Install:
● Timing chain tensioner
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a. Push down the timing chain tensioner rod
end by your finger, and fully wind up the
tensioner clockwise using a small flat-blade
screwdriver “1” .
NOTE:
The timing chain tensioner rod must be held by
the flat-blade screwdriver until the timing chain
tensioner bolt is tightened.
b. Assemble the timing chain tensioner and the
gasket in the cylinder.
c. Install the gasket and timing chain tensioner
cap bolt.
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4. Tighten:
● Camshaft sprocket bolts
CAUTION:
ECA13750
Be sure to tighten the camshaft sprocket
bolts to the specified torque to avoid the
possibility of the bolts coming loose and
damaging the engine.
NOTE:
Secure the generator rotor bolts and tighten the
camshaft sprocket bolts using a wrench.
5. Turn:
● Crankshaft
(several turns counterclockwise)
6. Check:
● Mark “a”
Make sure that generator rotor mark “a”
aligns with generator rotor cover mark “b”.
● Mark “c”
Make sure that camshaft sprocket mark “c”
aligns with cylinder head mark “d”.
Not aligned → Reassemble.
See the following assembling procedure.
Timing chain tensioner bolt
10 Nm (1.0 m•kg, 7.2 ft•lb)
Timing chain tensioner cap bolt
8 Nm (0.8 m•kg, 5.8 ft•lb)
1
T
R
.
.
T
R
.
.
Camshaft sprocket bolt
60 Nm (6.0 m•kg, 43 ft•lb)
T
R
.
.