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Derbi GP1 125-250 c.c. Workshop Manual Page 163

Gp1 125-250 c.c..
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- Wash and blow the flow screw.
- Check that the screw is free from deformation and/or oxida-
tion.
- Assemble the spring on the screw.
- Tighten the flow screw on the carburettor body.
- The final position of the screw must be defined by the exhaust
gas analysis.
- Prepare the carburettor for adjustment with the screw loose-
ned by 2 turns from the closed position.
WALBRO
- Before proceeding to reassembly, carefully clean the car-
burettor body using fuel and compressed air.
- Be especially careful to the fuel inlet duct and the pin seat.
- For the maximum circuit, check the air calibration shown
in the figure.
- Carefully clean the air holes shown in the figure.
- For the minimum circuit, check the correct cleaning of the
following points: air calibration, outlet section controlled by
the flow screw, progression holes close to the throttle valve.
N.B.
THE MINIMUM AIR IS CONTROLLED BY TWO CALIBRATIONS.
THAT OF THE CUT-OFF IS DIRECTLY OBTAINED IN THE CAR-
BURETTOR BODY.
- For the starter circuit, carefully blow the nozzle connection
duct since the nozzle support hides further internal calibra-
tions that are not accessible.
- Carefully blow the pickup nozzle.
N.B.
ITS OUTLET SECTION IS VERY SMALL AND FACES THE THRO-
TTLE VALVE. A WRONG ORIENTATION OF THE NOZZLE CAU-
SES A POOR SPRAYING.
162

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  • LIAM May 27, 2017 06:12:
    HI HAVE JUST BOUGHT A DERBI 125 CC CROSS CITY, REALLY WOULD LIKE TO BUY A WORKSHOP MANUAL PLEASE CAN YOU HELP