Yamaha YZ450F Owner's Service Manual page 214

3. Turn:
• Crankshaft
Counterclockwise several turns.
4. Check:
• Top dead center (TDC) mark on the rotor
Align with the crankcase alignment mark.
• Camshaft match marks
Align with the cylinder head surface.
Out of alignment  Adjust.
5. Install:
• Timing chain guide (top side) "1"
• Cylinder head cover gasket "2"
• Cylinder head cover "3"
• Bolt (cylinder head cover) "4"
Bolt (cylinder head cover)
10 Nm (1.0 m·kgf, 7.2 ft·lbf)
TIP
Before installation, apply the sealant to the cyl-
inder head cover gasket.
Three Bond No.1215®
90890-85505
4
4
2
6. Install:
• Cylinder head breather hose
• Spark plug
Spark plug
13 Nm (1.3m·kgf, 9.4 ft·lbf)
4
3
1
5-19
CAMSHAFT