Yamaha WaveRunner - Camshaft Sprockets Inspection; Timing Chain Tensioner Inspection

5-58
E
POWR
CAMSHAFTS
5. Measure:
• Camshaft journal diameter
a
Out of specification
→
Replace the cam-
shaft.
Within specification
→
Replace the cyl-
inder head and the camshaft caps as a
set.
Camshaft journal diameter:
24.46–24.47 mm
(0.9630–0.9634 in)
Camshaft sprockets inspection
1. Check:
• Camshaft sprocket
Wear/damage
→
Replace the camshaft
sprockets and timing chain as a set.
a
1/4 of a tooth
b
Correct
1
Timing chain
2
Camshaft sprocket
Timing chain tensioner inspection
1. Check:
• Timing chain tensioner
Cracks/damage/rough movement
→
Replace.
Checking steps:
• While lightly pressing the timing chain
tensioner rod by hand, turn the tensioner
rod fully clockwise 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 ten-
sioner housing smoothly. If there is rough
movement, replace the timing chain ten-
sioner.