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Flat track motorcycles can have either two-stroke or four-stroke engines in amateur competition. Flat track bikes have front and rear suspension, and rear brakes. The brakes are what make it completely distinct from speedway, as the brakes allow for a different cornering technique. Four-stroke motorcycles dominate professional competition and ...
Such tires are useful for enduro and dual-sport motorcycles and other vehicles designed to be used both off-road and on pavement. Some off-road tires are designed to be used with low inflation pressure on difficult terrain, reducing their rigidity and allowing the tread to better conform to the terrain. [3]
In 1985 the ATC250R was updated with a 246cc liquid cooled engine, and 6-speed transmission. This 2-stroke engine was notable for not incorporating a power-valve, featured commonly on other machines by 1985. Fuel was delivered via a 34 mm round carb in 1985 and flat slide carburetor for the remainder of production.
Animation of a two-stroke engine. A two-stroke (or two-stroke cycle) engine is a type of internal combustion engine that completes a power cycle with two strokes of the piston (one up and one down movement) in one revolution of the crankshaft in contrast to a four-stroke engine which requires four strokes of the piston in two crankshaft revolutions to complete a power cycle.
Yamaha entered the ATC market in 1980, after paying patent-right to Honda to produce their own version of the All Terrain Cycle. Starting modestly with a 125cc recreational ATC that would remain the foundation of their line through 1985, the YT125 featured a 2 stoke engine with sealed airbox with snorkel intake, an autolube oil injection system, and featured a narrow tunnel above the engine ...
As the early motorcycle industry progressed, larger tyre sizes accompanied larger engine displacements, so that by 1909–1914, 2 + 1 ⁄ 4 in (57 mm) section, 26 in (660 mm) diameter tyres were used on 250 to 350 cc (15 to 21 cu in) motorcycles, and 2 + 3 ⁄ 8 to 2 + 1 ⁄ 2 in (60 to 64 mm) section tyres appeared on motorcycles with ...
Grand Prix motorcycle racing refers to the premier category of motorcycle road racing. It is divided into three distinct classes: Moto3: Introduced in 2012, motorcycles in this class are 250cc with single-cylinder four-stroke engines Previously it featured 125 cc two-stroke motorcycles. This class is also restricted by rider age, with an upper ...
Supermoto has its origins in the 1970s when ABC’s Wide World of Sports was the highest-rated sports show in the United States. In 1979, ABC commissioned a made-for-TV event called "Superbikers," created by motorcycling journalist and promoter Gavin Trippe, [1] [2] [3] intended to find the ultimate all-around motorcycle racer by putting all star riders from different genres of racing on a ...
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