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10
CS-4400
2-3 Adjusting carburettor
(B)
L
(A)
SERVICE INFORMATION
idle adjust screw
H
(A)
(B)
1. Start engine and warm it up well for 2 - 3 minutes
with cycle of 5 seconds at WOT (Wide Open Throttle)
and 10 seconds at idling.
2. Using 2.5 mm wide blade screw driver, adjust L
mixture needle to obtain maximum idle speed.
3. Set idle speed to 3,500 r/min by turning idle adjust
screw (in the range of 3,300 to 3,700 r/min allowable).
4. Turn L mixture needle anticlockwise to reduce
engine idle speed 1000 r/min to set idle speed in
the range of 2,300 to 2,700 r/min.
NOTE : Engine speed must be allowed to stabilize
a minimum of 20 seconds after each adjustment of
L mixture needle to assure accurate tachometer
readings.
5. Turn H mixture needle anticlockwise at WOT until
engine speed drops less than 11,000 r/min.
6. Adjust WOT engine speed in the range of 11,500
to 13,000 r/min by turning H mixture needle clockwise.
NOTE : During H mixture needle adjustment, do not
run engine at high speed without load longer than
5 seconds.
7. If the engine speed at WOT is above 13,000r/min,
adjust H mixture needle anticlockwise and set
maximum engine speed at less than 13,000 r/min.
8. After adjusting carburettor, put the limiter cap on
the tip of 2.5 mm wood screw and install the caps
on L and H mixture needles.
NOTE : Align the limiter caps tabs (A) with locating
slots (B) in extended housing of carburettor.
9. Tap the respective limiter caps in as shown.
10.Start engine again and make it sure engine runs
at idle speed in the range of 2,300 to 2,800 r/min
and at WOT engine speed in the range of 11,500 to
13,000 r/min. Also make it sure chain would not turn
at engine idle speed and suitable acceleration.
NOTE : Initial carburettor setting (Idle adjust screw,
L and H mixture needles) shown here is to start the
engine after restoration or carburettor change. Idle
adjust screw, L and H needles turn for designated
engine revolution through procedures indicated here
may vary. As long as idle and WOT engine speed is
set in given range, variance would be ignorable.
CS-4400
CS-5100
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