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L – Rupp manufactured two L-series dirt bikes in 1973, the L80 and L100. Both bikes used 2-cycle Fuji engines, in 80 and 100cc sizes. They were equipped with four- and five-speed manual transmissions, respectively. SS – The SS-5 was Rupp's only dirt bike that used a Tecumseh engine and automatic transmission. The engine was a Tecumseh HS50 ...
The Honda CR250M had a two-stroke 29 horsepower engine, and weighed in at 229 pounds (104 kg). [2] [3] Designed by Soichiro Miyakoshi, the prototype production machine began testing in Japan in 1971, and on California motocross tracks in 1972. [4]
The "Pure Enduro" series of off-road racing motorcycles ran from 1977 through to 1984 in engine displacements from 175cc through 400cc. All engines were case-reed valve, air-cooled, two-stroke and single-cylinder with plain steel bores.
The XR1200 was released in the United States in 2009, in a special color scheme including Mirage Orange highlighting its dirt-tracker heritage. The first 750 XR1200 models in 2009 were pre-ordered and came with a number 1 tag for the front of the bike, autographed by Kenny Coolbeth and Scott Parker and a thank you/welcome letter from Harley ...
The bike had an 11,600 rpm redline [8] [better source needed] power and torque close to its 250 cc two-stroke rivals. [1] It benefited from engine compression braking, which allowed the engine to slow the bike down during deceleration, giving the brakes a rest. [1] The 1998 YZ400F was the first bike to come stock with a Keihin FCR carburetor.
The September 1973 issue of Dirt Bike argued that the 125 Honda Elsinore was the only off-road bike on the market at the time that offered both speed and reliability. [2] Other Japanese 125 cc motocross bikes available at the time would have needed major suspension , motor, and chassis upgrades to be used for motocross racing .