Yamaha YZ450F(Y Owner's Manual page 128

5. Install:
• Dowel pin "1"
• O-ring "2"
• Right crankcase
To left crankcase.
• Apply the lithium soap base grease
on the O-ring.
• Fit the right crankcase onto the left
crankcase. Tap lightly on the case
with soft hammer.
• When installing the crankcase, the
connecting rod should be posi-
tioned at TDC (top dead center).
6. Tighten:
• Bolt (hose guide) "1"
• Bolt (crankcase)
Bolt (crankcase):
12 Nm (1.2 m•kg, 8.7
ft•lb)
Tighten the crankcase tightening
bolts in stage, using a crisscross pat-
tern.
7. Install:
• Timing chain
• Timing chain guide (intake side)
• Bolt (timing chain guide)
Bolt (timing chain guide):
10 Nm (1.0 m•kg, 7.2
ft•lb)
8. Remove:
• Sealant
Forced out on the cylinder mating
surface.
CRANKCASE AND CRANKSHAFT
9. Apply:
• Engine oil
To the crank pin, bearing and oil
delivery hole.
10. Check:
• Crankshaft and transmission op-
eration.
Unsmooth operation → Repair.
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