Yamaha RS90GTZ Service Manual page 247

CAMSHAFTS
5. Measure:
• Camshaft journal diameter
• Out of specification → Replace the cam-
shaft.
• Within specification → Replace the cylinder
head and the camshaft caps as a set.
Camshaft journal diameter:
24.459 ~ 24.472 mm
(0.9630 ~ 0.9635 in)
6. Inspect:
• Camshaft sprocket
More than 1/4 tooth
the camshaft sprockets, timing chain, and
crankshaft as a set.
1/4 tooth
Correct
Timing chain
Camshaft sprocket
7. Inspect:
• Timing chain guide (top side)
Damage/wear → Replace
8. Remove:
• Timing chain tensioner rod
• Timing chain tensioner spring
• Timing chain tensioner housing
TIP
Squeeze the timing chain tensioner clip
and then remove the timing chain tensioner
rod and timing chain tensioner spring.
9. Inspect:
• Timing chain tensioner housing
• Timing chain tensioner rod
• Timing chain tensioner spring
Damage/wear → Replace the as a set.
5-22
ENG
wear → Replace
,