SERVICE INFORMATION
PB-2100
PB-2155
PB-2200SI
8
2-3 Adjusting carburettor
1. Start engine and warm it up well for about 3 - 5
minutes with cycle of 50 seconds at WOT (Wide
Open Throttle) and 10 seconds at idling.
2. Adjust H mixture needle to obtain maximum
engine speed at WOT. And then turn H mixture
needle clockwise until the engine speed starts to
drop.
3. When the engine speed starts to drop, turn H
mixture needle anticlockwise to obtain maximum
engine speed again. And then turn H mixture needle
anticlockwise further to reduce engine speed 20 to
30 r/min (PB-2100), 10 to 20 r/min (PB-2155,
PB-2200SI) from maximum engine speed.
4. Adjust the L mixture needle to obtain maximum
idle speed.
5. Set idle speed in the range of 2,950 to 3,050 r/min
by turning idle adjust screw.
6. Turn L mixture needle anticlockwise to reduce
engine idle speed 200 to 300 r/min and set engine
idle speed in the rage of 2,650 to 2,850 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.
7. After adjusting carburettor, install White limiter cap
on L mixture needle and Red limiter cap on H mixture
needle as shown.
NOTE : Before installing limiter caps, warm caps
in 90
°
C hot water for smooth installation. Make it
sure to use pliers or appropriate instrument to take
warmed up cap out from the water.
8. Tap respective limiter caps to the bottoms as
shown.
9. Start engine again and make it sure engine runs
in the range of 2,400 to 3,200 r/min at idling and the
range of 6,800 to 7,700 r/min at WOT. Also make it
sure suitable acceleration.
