Yamaha YZ450FA Automobile User Manual


 
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CRANKCASE AND CRANKSHAFT
5. Install:
• Dowel pin "1"
• Right crankcase
To left crankcase.
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 positioned at TDC (top dead
center).
6. Tighten:
• Bolt (crankcase)
Tighten the crankcase tightening bolts in stage,
using a crisscross pattern.
7. Install:
• Timing chain
• Timing chain guide (exhaust side)
• Bolt for timing chain guide (exhaust side))
8. Remove:
Sealant
Forced out on the cylinder mating surface.
9. Apply:
• Engine oil
To the crank pin, bearing and oil delivery
hole.
10.Check:
• Crankshaft and transmission operation.
Unsmooth operation Repair.
Bolt (crankcase):
12 Nm (1.2 m•kg, 8.7 ft•lb)
Bolt for timing chain guide (exhaust
side):
10 Nm (1.0 m•kg, 7.2 ft•lb)