Instruction manual

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1. Engine Impulse: Actuates Fuel Pump Diaphragm alternating pressure-vacuum

pulses.

2. Fuel Pump Diaphragm: Fluctuates in response to engine impulse. Transfers

fuel through Fuel Pump Valves.

3. Fuel Inlet: Fuel drawn from tank.

4. Inlet Valve: Responds to Fuel Pump Diaphragm. Opens during vacuum pulse.

Closes during pressure pulse.

5. Outlet Valve: Closes during vacuum pulse. Opens during pressure pulse.

6. Filter Screen: Filter fuel on route to Metering Chamber.

7. Inlet Needle Valve: Lifts off seat to allow fuel entry into Metering Chamber.

8. Butterfly Valve: Shuts off air flow stopping engine.

9. Fuel Needle: Adjusts fuel richness.

10. Atmospheric Vent: Allows air Metering Diaphragm.

11. Metering Diaphragm: Drawn up engine is running to activate Metering Lever.

12. Metering Lever: Lifts Inlet Needle

13. Metering Lever Spring: Transmits force to lever. Closes Inlet Valve as

Metering Chamber fills.

14. Metering Chamber: Fuel reservoir.

15. Nozzle Well: Fuel is drawn in from Chamber at high speed.

16. Nozzle: Increases fuel discharge at high speed.

17. Venturi: Increases air velocity at Nozzle creating a suction to draw fuel into

Throttle Bore.

18. Priming Pump: Used to supply fuel to antechamber for starting.

WARNING

IF THE MIXTURE IS TOO LEAN THE ENGINE MAY DIE AT THIS POINT.

UPON RESTARTING, FLAME MAY MOMENTARILY SHOOT OUT THE

DISCHARGE TUBE.

NOTE

This section outlines the operating systems in the Carburetor. Refer to "The

Starting System Diagram" and the "Carburetor System Diagram" for a pictorial

representation of all systems and names. The end of this section contains

procedures for all possible Carburetor adjustments.