Yamaha VMX12 2001 - Checking the Timing Chain, Camshaft Sprockets; And Timing Chain Guides; Checking the Timing Chain Tensioner

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ENG
CAMSHAFTS
EAS00208
CHECKING THE TIMING CHAIN,
CAMSHAFT SPROCKETS, AND TIMING
CHAIN GUIDES
The following procedure applies to all of the
camshaft sprockets and timing chain guides.
1. Check:
• timing chain
Damage/stiffness
→
Replace the timing
chain and camshaft sprockets as a set.
2. Check:
• camshaft sprocket
More than 1/4 tooth wear
a →
Replace the
camshaft sprockets and the timing chain as
a set.
a
1/4 tooth
b
Correct
1
Timing chain roller
2
Camshaft sprocket
3. Check:
• timing chain guide (exhaust side)
• timing chain guide (top side)
Damage/wear
→
Replace the defective
part(s).
EAS00210
CHECKING THE TIMING CHAIN
TENSIONER
1. Check:
• timing chain tensioner
Cracks/damage
→
Replace.
• one-way cam operation
Rough movement
→
Replace the timing
chain tensioner housing.
2. Check:
• cap bolt
• copper washer
• spring
• one-way cam
• gasket
• timing chain tensioner rod
Damage/wear
→
Replace the defective
part(s).