Yamaha RS90K Manuel D'atelier page 456

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1
CAMSHAFTS
6. Inspect:
• Camshaft sprocket
More than 1/4 tooth a wear → Replace the
camshaft sprockets and the timing chain as a
set.
a 1/4 tooth
b Correct
1 Timing chain roller
2 Camshaft sprocket
7. Inspect:
• Timing chain guide (top side 1)
Damage/wear → Replace the timing chain
guide.
8. Inspect:
• Timing chain tensioner
Cracks/damage → Replace.
Inspection steps:
• While lightly pressing the timing chain tensioner
rod by hand, turn the tensioner rod fully clock-
wise with a thin screwdriver 1.
• Remove the screwdriver and slowly release the
timing chain tensioner rod.
• Make sure that the timing chain tensioner rod
comes out of the timing chain tensioner housing
smoothly. If there is rough movement, replace
the timing chain tensioner.
9. Inspect:
• All parts
Damage/wear → Replace the defective
part(-s).
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ENG