Installation - Yamaha RS90K Service Manual

a
1
b c
b
d
c
2
b
a
1
e
d
d
f
a
2
c
d
1
2
e
f
5-20
CAMSHAFTS

INSTALLATION

1. Install:
• Exhaust camshaft sprocket 1
• Intake camshaft sprocket 2
(with the special tool 3)
Rotor holding tool:
90890-01235, YU-01235
• Camshaft sprocket bolts
Camshaft sprocket bolt:
24 Nm (2.4 m · kg, 17 ft · lb)
NOTE:
Make sure that the holes a in the cylinder #3 cam
and marks b and c on the camshaft sprockets are
in the position shown in the illustration.
b: Exhaust side "→"
c: Intake side "—"
d: Cylinder #3 - cam
2. Install:
• Exhaust camshaft 1
• Intake camshaft 2
(with the camshaft sprockets)
Installation steps:
• Turn the crankshaft clockwise.
• When piston #3 is at TDC on the compression
stroke, align the "I" mark a on the A.C. mag-
neto rotor with the stationary pointer b on the
A.C. magneto cover.
• Install the timing chain onto both camshaft
sprockets, and then install the camshafts.
NOTE:
• Install the camshafts with the hole c in the cylin-
der #3 - cam facing up.
• When installing the timing chain, start with the
exhaust camshaft and be sure to keep the timing
chain as tight as possible on the exhaust side.
• Make sure the marks d and e on the timing
chain sprockets are parallel with the edge of the
cylinder head.
d: Exhaust side "→"
e: Intake side "—"
f: Cylinder #3 - cam
ENG