Description1. Carburetor structure： Components of Carburetor usually include a storage chamber for liquid fuel, a choke, an idling (or slow-running) jet, a main jet, a venturi-shaped air-flow restriction, and an accelerator pump. The quantity of fuel in the storage chamber is controlled by a valve actuated by a float.2. Carburetor is a kind of oil supply device in the engine of automobile，The goal of a carburetor is to mix just the right amount of gasoline with air so that the engine runs properly.3 Function: Add more horse power while maintaining near stock fuel mileageApplicationCarburetor compatible for modification with Any application that utilizes the IDF carburetor. Replacement compatible for Bug / Compatible for Volkswagen / Beetle / Compatible for VW / Fiat / Porsche.SpecificationFor Dual Application, 2 Barrel Carb CarburetorMain Jets: 115 Emulsion Tubes: F11, F-11Air Corrector Jets: .200Idle Jets: 52Needle Compatible for Seat: 200 Accelerator Pump for Jet: .50 Pump Exhaust for Jet: 550Venturis: 28mmAux Venturis: 4.50mmNeedle Valve: 1.75mmMeasurement of base plate: 68MMMeasurement of barrel: 39,6 MMType of throttle: manualManufacturer Part Number: for 40 IDFMaterial: Zinc Alloyconstruction: Heavy duty metal constructionPlacement on Vehicle: FrontWarranty:one yearweight：2.3kgpackage size:23X21X15cmPackage Included: 1pc Car Carburetor, 2 pcs mounting gasketsFeatures1.To mix air and gasoline in a correct ratio to ensure proper engine function，Give your machine the new power it deserves.2 Add 5~10% horsepower and maintain near stock fuel mileage.3 Brand new and high quality carburetor replacement part. Helpful for avoiding waste of oil to some extent.4. Profiled gas (butterfly) waves ， cold start circuit eliminated for a 20% larger float bowl more fuel volume5 Specially designed and tested to exact OEM standards ， Easy installation with mounting gasket.6 Aftermarket high performance engine carburetor replacement Notice * Please confirm your old part number matches up with one of the part numbers above * Professional installation is highly recommended (No Instruction Included) * For any needs please contact us.