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Yamaha XT550J - Checking Ignition Timing; Clutch Adjustment; Free Play Adjustment; Mechanism Adjustment

Yamaha XT550J
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5.
Install the oil pressure gauge adapter
(special tool P / N.
YU-04083).
6.
Install a oil pressure gauge or pass a
vinyl tube over the handle bar and
put
it
into the oil tank.
1.
Oil
pressure gauge adapter
7. Start the engine.
8.
If oil pressure is below the specified
range or
if
oil does not
flow
into the oil
tank, stop the engine immediately, and
check for the cause.
Specified oil pressure:
9.81
-19.6
kPa
(O.1-0.2kg/cm2,1.42-2.84psi)
L.
Clutch
Adjustment
This model has
two
clutch cable length ad-
justers and a clutch mechanism adjuster.
Cable
length adjusters are used
to
take up
slack from cable stretch and
to
provide suffi-
cient free play for proper clutch operation
under various operating conditions. The
clutch mechanism adjuster is used
to
provide
the correct amount
of
clutch
"throw"
for pro-
per disengagement.
Normally, once the
mechanism
is
properly adjusted, the only
ad-
justment required is maintenance
of
free play
at the clutch handle lever.
Free
play
adjustment
Loosen either the handle lever adjuster lock
nut
or the cable in-line length adjuster lock
nut. Next, turn the length adjuster either
in
or
out
until proper lever free play is achieved.
2-7
1.
Adjuster lock
nut
2. Adjuster
Mechanism
adjustment
See
Chapter 3
"Clutch
Mechanical Adjust-
ment"
.
M.
Checking
Ignition
Timing
Check the ignition timing with a timing light
by observing the stationary pointer and the
marks stamped on the flywheel.
1. Timing light
1.
Remove the upper blind plug on the left
crankcase cover.
2.
Connect the timing light
to
the spark
plug wire.
3.
Start the engine, and
keep
the engine
running at the specified speed.
Use
a
tachometer
to
check the engine speed.
Engine Speed:
1,200
r/min
4.
The stationary pointer
(in
the timing
window) should
be
within the firing
range shown on the flywheel.
If
the
pointer
is
not
within the range or
if
it
is
not steady, check the flywheel
and/
or
pickup assembly for tightness
and/or
damage. (See "Chapter
6:
Electrical"
for further information.)

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