Checking The Camshaft Sprocket; Checking The Timing Chain Tensioner; Installing The Cylinder Head - Yamaha YP250R 2005 Service Manual

CYLINDER HEAD
EAS00207

CHECKING THE CAMSHAFT SPROCKET

1. Check:
• camshaft sprocket
More than 1/4 tooth wear a → Replace the
camshaft sprocket and the timing chain as a
set.
a 1/4 tooth
b Correct
1 Timing chain roller
2 Camshaft sprocket
EAS00210
CHECKING THE TIMING CHAIN
TENSIONER
1. Check:
• timing chain tensioner
Cracks/damage → Replace.
2. Check:
• one-way cam operation
Rough movement → Replace the timing
chain tensioner housing.
3. Check:
• cap bolt
• spring
• one-way cam
• timing chain tensioner rod
Damage/wear → Replace the defective
part(s).

INSTALLING THE CYLINDER HEAD

1. Install:
• dowel pins
• cylinder head gasket
2. Install:
• cylinder head
NOTE:
Pass the timing chain through the timing chain
cavity.
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ENG
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