Yamaha RS90K Manuel D'atelier page 550

1
19. Inspect:
• Balancer drive gear
• Balancer driven gear 1
1
Damage/wear → Replace the crankshaft
assembly and balancer driven gear as a set.
Excessive noise during operation → Replace
the crankshaft assembly and balancer driven
gear as a set.
20. Inspect:
• Water pump drive gear
Cracks/damage/wear → Replace.
21. Inspect:
• Timing chain 1
• Oil pump drive chain 2
Damage/stiffness → Replace the chain and
sprocket as a set.
22. Inspect:
• Timing chain guide (intake side) 1
• Timing chain guide (exhaust side) 2
Damage/wear → Replace the timing chain
guide.
2
23. Inspect:
• Primary sheave drive shaft assembly
Damage → Replace.
5-66
ENG
CRANKCASE