Yamaha 4TX-AE1, Service Manual

Page: 135 / 332

4-11
CAMSHAFT
ENG
NOTE:
10 Nm (1.0 m kg)
NOTE:
CAUTION:
NOTE:
INSTALLATION
1. Install:
Exhaust camshaft 1
Intake camshaft 2
(with camshaft sprocket temporarily tighten)
Dowel pins 3
Install the camshaft with the punch mark a facing
upward.
2. Install:
Camshaft caps
Install the camshaft cap with the arrow mark a
embossed facing timing chain of the engine.
Tighten the camshaft cap bolts in a crisscross
pattern from the inside to outwards.
Do not install the bolts at b marked place in this
stage.
The camshaft cap bolts must be tightened
evenly or damage to the cylinder head, cam-
shaft caps and camshaft will result.
3. Install:
Camshaft sprockets
Installation steps:
Turn the crankshaft counterclockwise until the
“T” mark a on the A.C. magneto is aligned with
the stationary pointer b on the crankcase cover
(left) when #1 piston is at TDC.
Fit the timing chain onto both camshaft sprockets
and install the camshaft sprockets on the cam-
shafts.
When installing the camshaft sprockets, start with
the exhaust camshaft to keep the timing chain as
tense as possible on the exhaust side, and set the
match marks c to be parallel with the case sur-
face on the corresponding sides.
“I”: Intake side
“E”: Exhaust side