13. FUEL SYSTEM/CARBURETOR/ FUEL PUMP/ FUEL TANK GRAND DINK 250 OPERATION OF CARBURETOR JETS 1. LOW SPEED Venturi (slightly opened throttle valve) Air Air Bleed Holes Mixture....... Low Speed Air Inlet Fuel in Float Chamber Slow Jet -------------------- Low Speed Small Jet Holes 2.MIDDLE SPEED Venturi (halfway opened throttle valve) Air Bleed Holes Mixture....... Air High Speed Air Jet Fuel in Float Chamber Main Jet Main Jet (The slow jet also works.) Low & Middle Speed Supplementary Device: Vacuum Tube Low Speed Air Jet ACV Vacuum Diaphragm Throttle Valve Air Pilot Screw Main Jet Bypass Jet Slow Jet Low & Middle Speed Supplementary Fuel Inlets 13-3