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This layout allowed the real fuel tank to sit behind the cylinders, low between the frame rails, and further aided with lowering the center of gravity. Forward of this sat the airbox, with four 32 mm Mikuni downdraft carburetors, and all these assemblies were covered by a plastic cover dummy petrol tank.
The water-cooled 4-stroke XZ550 was the first Yamaha model to feature automotive-style downdraft carburetors, with the air cleaner box mounted atop the carburetors to take advantage of a direct path for the fuel-air mixture into the cylinders - a more efficient delivery than the sidedraft carburetors common at the time.
Two-barrel downdraft Holley 2280 carburetor Cross-sectional schematic. A carburetor (also spelled carburettor or carburetter) [1] [2] [3] is a device used by a gasoline internal combustion engine to control and mix air and fuel entering the engine. [4]
Mikuni carburettor BS 36 SS from a Suzuki motorcycle Mikuni Corporation ( 株式会社ミクニ , Kabushiki gaisha Mikuni ) is a Japanese Automotive products manufacturing company. Their business activities is focused on carburetors, fuel injectors and other automobile and motorcycle related equipment.
The four 34 mm Mikuni constant-velocity downdraft carburettors are mounted in a bank behind and above the cylinders and feed each cylinder through short, straight and almost vertical inlet. The airbox is situated in what would conventionally be the forward part of the fuel tank.
Twin downdraft Mikuni carburetors were standard until 2008, when fuel injection became available. [3] Cycle World tested the GT250R's acceleration at 0 to 97 km/h (0 to 60 mph) in 7.6 seconds and 0.0 to 0.4 km (0 to 1 ⁄ 4 mi) in 16.06 seconds at 128.89 km/h (80.09 mph). [1]
Mikuni, common on Japanese motorcycles, especially in the 1980s. Mikuni also made racing carburetors for Japanese, British and European cars. Original equipment on Mitsubishi engines. Reece Fish, in Volkswagen, Austin Mini, Morris Mini. Rochester Products, a General Motors subsidiary; also sold Weber/Magneti Marelli carburetors under license).
The new Mikuni model BST38SS carburetors were 38 mm diameter and featured an additional "Powerjet" high-speed circuit that was used to fine-tune fuel mixture from 10,000 rpm to the rev limiter. In the unrestricted USA bikes, the Powerjet circuit was jetted with a "zero" sized jet and activating the circuit simply required replacing the "zero ...