Checking The Camshaft Sprocket; Checking The Cyl. Head Cover Assy; Checking The Timing Chain Guides; Checking The Timing Chain Tensioner Assembly - Yamaha Raptor 90 YFM90RA 2011 Service Manual

CYLINDER HEAD
3. Remove:
cam shaft comp.
•
head assy.
• cyl.
TIP
Fasten a safety wire to the timing chain to
prevent it from falling into crankcase.
EBS00224

CHECKING THE CAMSHAFT SPROCKET

1. Check:
• camshaft sprocket
More than 1/4 tooth wear
cam shaft comp. and timing chain as a set.
1/4 of a tooth
correct
roller
sprocket

CHECKING THE CYL. HEAD COVER ASSY.

1. Check:
• cyl. head cover assy.
• o-rings
Cracks/damage → Replace.
EBS00226

CHECKING THE TIMING CHAIN GUIDES

1. Check:
• intake side timing chain guide
• exhaust side timing chain guide
Wear/damage → Replace.
EBS00228
CHECKING THE TIMING CHAIN
TENSIONER ASSEMBLY
1. Check:
• chain tensioner assembly
Wear/damage → Replace.
4 - 7
ENG
→ Replace the