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Weber carburetor, Italian, now made in Spain, owned by Magneti Marelli. Wheeler–Schebler Carburetor Company. Zama Group, primarily an OEM provider. Zenith Carburetor Company, American subsidiary of Société du carburateur Zénith. Zenith Carburettor Company (British), used on Austin cars. Also produced the Zenith-Stromberg carburetors.
In SU and other (e.g. Zenith-Stromberg) variable jet carburetors, it was mainly controlled by varying the jet size. The orientation of the carburetor is a design consideration but does not significantly alter the working principles. Older engines used updraft carburetors, where the air enters from below the carburetor and exits through the top.
A 34mm carburetor was used along with a reed intake valve. The bike was given a six-speed gearbox with a very low ratio first gear to help in tackling technical trial sections. The frame was based on that of the YZ but the steering rake was increased to lengthen the bike and improve high speed stability, facilitated by a high sixth gear.
A stroke is the action of a piston travelling the full length of its cylinder.In a two-stroke engine, one of the two strokes combines primarily the intake stroke and the combustion stroke, while the other stroke primarily combines the compression stroke and the exhaust stroke, though technically since both ports are exposed during both the combustion and compression strokes, some reversion ...
The YZ125 has a 124 cc (7.6 cu in) reed valve-inducted two-stroke engine. It was air cooled from 1974 to 1980, and liquid cooled since 1981. It has a Mikuni 38 mm TMX series carburetor. [6] The engine produces 35 hp (26 kW). [1] The YZ125 has been built with five- or six-speed manual sequential gearbox depending on model year.
Data from Cliche General characteristics Type: twin-cylinder, two-stroke engine Displacement: 436 cc (26.61 cu inches) Dry weight: 49 lb (22 kg) Components Valvetrain: piston ported Fuel system: Mikuni 34 mm slide-type carburetor Oil system: premixed oil and fuel Cooling system: air cooled Reduction gear: aftermarket reduction drive for aircraft use Performance Power output: 38 hp (28 kW) at ...