Yamaha YXR660FAS Service Manual Page 150

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ENG
CAMSHAFT AND CYLINDER HEAD
CHECKING THE CAMSHAFT SPROCKET
1. Check:
camshaft sprocket
Wear/damage Replace the camshaft
sprocket and timing chain as a set.
a
1/4 of a tooth
b
Correct
1
Timing chain
2
Sprocket
CHECKING THE DECOMPRESSION
SYSTEM
1. Check:
decompression system
▼▼▼ ▼▼▼ ▼▼▼ ▼▼▼ ▼▼▼ ▼▼▼ ▼▼▼
Check while the camshaft sprocket is installed
on the camshaft.
a. Check that the decompressor lever pin
1
projects from the camshaft.
b. Check that the decompressor cam
2
moves smoothly.
▲▲▲ ▲▲▲ ▲▲▲ ▲▲▲ ▲▲▲ ▲▲▲ ▲▲▲
CHECKING THE TIMING CHAIN GUIDE
(EXHAUST SIDE)
1. Check:
timing chain guide (exhaust side)
Wear/damage Replace.
CHECKING THE TIMING CHAIN
TENSIONER
1. Check:
timing chain tensioner
Cracks/damage/rough movement
Replace.
▼▼▼ ▼▼▼ ▼▼▼ ▼▼▼ ▼▼▼ ▼▼▼ ▼▼▼
a. Lightly press the timing chain tensioner rod
into the timing chain tensioner housing by
hand.
NOTE:
While pressing the timing chain tensioner rod,
wind it clockwise with a thin screwdriver
1
until it stops.
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