Yamaha XS650G 1978, Supplementary Service Manual

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*ENGINE
A. IGNITION TIMING
The ignition system is modified for easier
maintenance. Thus, the following “ignition
timing check” should be changed,
Ignition timing check
1. Ignition timing is checked with a timing
light by observing the position of the
rotor pointer and the marks stamped on
the timing plate.
The timing plate is marked as follows.
Firing range for No. 1
Top Dead Center for No.
cylinder
2. Connect the timing light to the left
cylinder spark plug lead wire.
3. Start the engine and keep the engine
speed as specified. Use a tachometer to
check the engine speed.
B. PICK-UP COIL ASSEMBLY
The method of mounting the pick-up coil
assembly is changed for easier service work.
Thus, the followings “Pick-up coil assembly
removal” and “Pick-up coil assembly reinstal-
lation” should be changed.
Pick-up coil assembly removal
Remove the pick-up coil securing screws and
remove the pick-up coil assembly.
Pick-up coil assembly reinstallation
Install the pick-up coil assembly on to the
stator assembly.
4.
Specified engine speed:
1,200 r/min
The rotor pointer should be within
the limits of
on the timing plate.
If it exceeds the limits or does not
steady, check the timing plate for tight-
ness and/or ignition system for damage.
NOTE:
Ignition timing is not adjustable.
C. FUEL LEVEL
The carburetor is furnished with a drain screw
to provide easy access to service work. Thus,
the following “Fuel level measurement”
should be added.
Fuel level measurement
NOTE:
Before checking the fuel level, note the follow-
ing:
1. Place the motorcycle on a level surface.
2. Adjust the motorcycle position by plac-
ing a suitable stand or a garage jack
under the engine so that the carburetor
is positioned vertically.
2.
Connect the level gauge (special tool) or
a vinyl pipe of 6 mm (0.24 in) in inside
diameter to the float bowl nozzle left or
right side carburetor.
Set the gauge as shown and loosen the
drain screw.