Engine; Valve Clearance Adjustment - Yamaha SZR 660 Service Manual

VALVE CLEARANCE ADJUSTMENT
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ENGINE
VALVE
CLEARANCE ADJUSTMENT
NOTE:
Valve clearance
must be
adjusted
when
the
engine
is at
ambient temperature.
Adjust valve clearance with the
piston
under
compression
at top dead centre.
CAUTION:
When
removing the spark pfug
and
tappet cover,
be careful not
to
drop foreign objects inside the
engine.
A
WARNING
Hold
the
motorcycle
firmly
in
place
to
prevent
it
falling
over during the
operation.
1.
Remove:
•
Seat
•
Fuel tank
•
Cowling
• See the section "SEAT,
FUEL TANK AND
REAR COWLING"
and "COWLING".
2-
Remove:
• Screws
(1) (2)
(fastening the
radiator)
• Screw
(3)
3.
Remove:
• Radiator
(4)
(disconnect the electric
connector)
4.
Loosen:
•
Carburetor manifold clamps
(5)
5.
Remove:
•
Air cleaner
case assembly
(6)
•
Air panel
(7)
VALVE CLEARANCE ADJUSTMENT
INSP
ADJ
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9.
Turn:
•
Driving shaft anticlockwise (using
a
wrench)
10. Align:
•
Reference mark 'T
f
on
the flywheel
(1)
with the fixed reference
mark on
the crank-
case
(2)
NOTE:
, ,,
„
.
,
Check
that
the piston
is
under compression
at top
dead
centre.
(3)
Ignition
timing reference
mark
11.
Check:
• Valve clearance using
the special
gauge
(T)
Out
of
specification -> Adjust.
^
Valve clearance
(cold):
Suction:
0.10-0.15
mm
Exhaust:
0.15-0.20
mm
12. Adjust:
•
Valve clearance
Adjustment:
• Loosen
the lock nut
(1).
•
Fit
a thickness
gauge
(2)
between
the rocker
arm
and
the valve stem.
• Turn the adjuster
(3)
clockwise
or
anticlockwise
using the special tool (4) to
obtain the required
clearance.
11
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6.
Disconnect:
•
Spark plug cap
7.
Remove:
•
Spark plug
• Tappet cover
(8)
(suction)
• Tappet covers
(9)
(exhaust)
8.
Remove:
• Cap
(10)
• Cap
(11)
Special tool:
P/N. YM-08035
P/N.
90890-01311
Holding the adjuster firmly in
place, lock
tighten
lock
nut.
Lock
nut:
14Nm{1.4mkg)
3-7 3-8