Yamaha XS650SE, Shop Manual

Page: 171 / 215

1. Right cylinder timing adjustment
2. Left cylinder timing
F. Spark plug
Check electrode condition and wear, insulator
color and electrode gap. Use a wire gauge for
a adjusting the plug gap. If the electrodes
become too worn, replace it.
When installing the plug, always clean the
gasket surface, wipe off any grime that might
be present on the surface of the spark plug,
and torque the spark plug properly.
Standard spark plug:
N-7Y (CHAMPION) or (NGK)
Spark plug gap:
0.7 0.8 mm (0.028 0.031 in)
Spark plug tightening torque:
2.0 m-kg (14.5 ft-lb)
(PAGE 22 29)
33. INSPECTION
AND REPAIR
D. Valve spring
1. Checking the valve springs
d. Valve spring specifications
Specifications should be changed
a s
follows:
Installed length 35 mm 37 mm
(1.378
(1.457
25.3-28.1 kg 53.5-81.5 kg
(118.0 -135.6
length 25.5 mm 27.5 mm
in)
in)
Allowable tilt from 1.6 mm or
vertical (0.063 in)
(PAGE 29 33)
3-4. ENGINE ASSEMBLY AND ADJUSTMENT
0. Engine
Specifications should be changed as
Engine mounting bolt
Upper Nut) M8 1.8 m-kg
Upper
M l 0 3.0 m-kg (21.7 ft-lb)
Front Nut) M l 0 4.6 m-kg (33.3 ft-lb)
Rear Nut) M l 0 4.1 m-kg (29.7 ft-lb)
Rear under
Nut)
M l 0 4.6 m-kg (33.3 ft-lb)
Under Nut)
9.0 m-kg (65.1 ft-lb)
(PAGE 39 40)
5-1. FRONT WHEEL
C. Front wheel inspection
1. Check for cracks, bends or warpage of
wheels. If a wheel is deformed or crack-
ed, it must be replaced.
NOTE:
These aluminum wheels are not designed for
use with tubeless tires.
2.
3.
Check wheel run-out
If deflection exceeds tolerance, check
wheel bearing or replace wheel as required.
Check wheel balance
Rotate wheel lightly several times and
observe resting position.
If wheels is not statically balanced,
wheel will come to rest at the same
po-
sition. Install balance weight at lighter
position (at top) as illustrated.
NOTE:
The wheel should be balanced with brake disc
installed.
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