Checking The Camshaft Sprockets; Checking The Timing Chain Guides; Checking The Timing Chain Tensioner; Installing The Camshafts - Yamaha FJR13AG Service Manual

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5. Measure:
• Camshaft journal diameter "a"
Out of specification → Replace the camshaft.
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)
EAS30936

CHECKING THE CAMSHAFT SPROCKETS

1. Check:
• Camshaft sprockets
More than 1/4 tooth wear "a" → Replace the
camshaft sprockets, timing chain, and crank-
shaft as a set.
a. 1/4 tooth
b. Correct
1. Timing chain roller
2. Camshaft sprocket
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5-17
EAS30265

CHECKING THE TIMING CHAIN GUIDES

1. Check:
• Timing chain guide (exhaust side)
• Timing chain guide (intake side)
• Timing chain guide (upper side)
Damage/wear → Replace the defective
part(s).
EAS30266

CHECKING THE TIMING CHAIN TENSIONER

1. Check:
• Timing chain tensioner
Cracks/damage/rough movement → Re-
place.
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a. Lightly press the timing chain tensioner rod
into the timing chain tensioner housing by
hand.
TIP
While pressing the timing chain tensioner rod,
wind it clockwise with a thin screwdriver "1" until
it stops.
b. Remove the screwdriver and slowly release
the timing chain tensioner rod.
c. Make sure that the timing chain tensioner rod
comes out of the timing chain tensioner hous-
ing smoothly. If there is rough movement, re-
place the timing chain tensioner.
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EAS30269

INSTALLING THE CAMSHAFTS

1. Install:
• Exhaust camshaft sprocket
CAMSHAFTS
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1
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