Yamaha VMX12 2001 Service Manual page 146

CAMSHAFTS
CAUTION:
@
The camshaft cap bolts must be tightened
evenly or damage to the cylinder head,
camshaft caps, and camshafts will result.
@
Camshaft cap bolt
10 Nm (1.0 m • kg)
g. Lubricate the camshaft bearing surfaces,
camshaft lobes, and camshaft journals with
engine oil.
2. Install:
• intake camshaft sprocket
• exhaust camshaft sprocket
(onto the camshafts)
CAUTION:
@
Do not turn the crankshaft when installing
the camshaft sprockets to avoid damage or
improper valve.
@
a. Install the timing chain onto the intake cam-
shaft sprocket.
b. Install the intake camshaft sprocket with the
"REAR" mark facing out, and then finger
tighten the camshaft sprocket bolts.
NOTE:
@
Align the "IN" mark 1 hole in the intake cam-
shaft sprocket with the thread hole in the cam-
shaft.
@
c. Turn the intake camshaft so that the cam-
shaft timing mark 2 (o: small hole) is
aligned with the camshaft cap mark 3.
d. To remove the timing chain slack, force the
intake camshaft counterclockwise.
e. Install the timing chain onto the exhaust
camshaft sprocket.
f. Install the exhaust camshaft sprocket with
the "REAR" mark facing out, and then finger
tighten the camshaft sprocket bolts.
NOTE:
@
Align the "EX" mark hole in the exhaust cam-
shaft sprocket with the thread hole in the cam-
shaft.
@
4 - 16
ENG