Checking The Balancer Shaft Assembly; Checking The Crankcase; Checking The Timing Chain And Timing Chain Guide (Intake Side) - Yamaha 2004 YP400 Service Manual

Yamaha yp400(s) scooter service manual
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CRANKSHAFT
CHECKING THE BALANCER SHAFT
ASSEMBLY
1. Check:
• balancer shaft assembly
Cracks/damage → Replace.
EAS00399

CHECKING THE CRANKCASE

1. Thoroughly wash the crankcase halves in a
mild solvent.
2. Thoroughly clean all the gasket surfaces
and crankcase mating surfaces.
3. Check:
• crankcase
Cracks/damage → Replace.
• oil delivery passages
Obstruction → Blow out with compressed
air.
EAS00207
CHECKING THE TIMING CHAIN AND
TIMING CHAIN GUIDE (INTAKE SIDE)
1. Check:
• timing chain
Damage/stiffness → Replace the timing
chain and camshaft sprockets as a set.
2. Check:
• timing chain guide (intake side)
Damage/wear → Replace.
5 - 66
ENG

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2004 yp400s

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