Yamaha XS650 Series, Shop Manual

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E. Cam chain adjustment
Check/Adjust the cam chain tension as
follows:
Remove the cap nut.
Turn the left end of the crankshaft
counterclockwise. As the crankshaft is
turning, check to see that the cam chain
adjuster push rod is flush with the end of
the bolt. If not, turn the adjuster bolt
until the push rod is flush.
Reinstall the cap nut. The cap nut acts
as a lock nut for the adjuster.
1. Cap 2. Adjuster bolt 3. Push rod
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B. Air filters
2.
C.
Cleaning method
The air filter element should be cleaned
every 8,000 km (5,000 It should be
cleaned more often if the machine is
operated in extremely dusty areas.
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G. Drive chain
1. Tension check
Inspect the drive chain with both tires
touching the ground. Check the tension
halfway between drive and driven
sprockets. The normal vertical deflec-
tion is approximately 20 30 mm (0.79
1.18 in)
a .
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C. Ignition timing
1. Point gap must be set before setting
timing.
2. Ignition timing is checked with a timing
light by observing the position of the
stationary marks stamped on the
and the pointer on the generator rotor.
1. Top dead center
2.
3. Advanced mark
3.
4.
5.
Connect timing light to right (left)
cylinder spark plug lead wire. Ignition
timing of right cylinder must be set first.
Start the engine and keep the engine
speed as specified on the label. Use a
tachometer for checking.
The rotor pointer should line up the “F”
stamped timing mark on the at
a specified engine speed. If it does not
align, loosen the two breaker backing
plate screws (breaker assembly holding
screws for left cylinder) and move the
complete backing plate (breaker assem-
bly for left cylinder) until the point
marks align.