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The air cooled engines were poorly reviewed in publications at the time, with Dirt Bike magazine most famously calling the bike "unridable" in their June of '83 issue. Kawasaki responded by lower compression ratios to make the bike more manageable and reliable, but would ultimately design a new engine from the ground up for the '85 model year.
The original YZ250 of 1974 used an air-cooled 250cc two-stroke engine of 70 mm bore and a 64 mm stroke, which was improved semi-annually. The air-cooled motor was replaced in 1982 with a 249 cc liquid-cooled two-stroke reed-valved engine with a mechanical, rather than servo-driven, YPVS exhaust valve for a wider spread of power.
Legends car based on Ford coupé 1934 U.S. Legends 2016 Dirt Nationals at 141 Speedway Racing on Beaver Dam Raceway dirt track. Legends car racing is a style of auto racing designed primarily to promote exciting racing and to keep costs down (as of 2022, a brand-new Legends car could be purchased in the USA for $17,500 USD [1]).
Dirt track racing is a form of motorsport held on clay or dirt surfaced banked oval racetracks. Dirt track racing started in the United States before World War I and became widespread during the 1920s and 1930s using both automobiles and motorcycles, spreading throughout Japan and often running on horse racing tracks.
The company started making motorcycles in 1948. Focusing on two-stroke street bikes through the 1950s and 1960s, the company began development and production of off-road motorcycles in the late 1960s with the introduction of the 100 cc motocross model XC-100 in 1967. [4] The off-road models were initially observed trials bikes. [5]
The potential of the new machine was found so impressive by Dirt Bike Magazine, they named it Bike of the Year, [13] two years ahead of its release. In February 1999, Dirt Bike editor Ron Lawson was quoted regarding the unreleased bike's possible appeal to "older moto guys who want kind of a status symbol" as opposed to novice motorcyclists. [14]
Sport bikes [ edit ] Kawasaki KRR 150 (Ninja KR 150R/ KR 150SP/ KR 150SE/KR 150SSE, Ninja KRR 150/KRR 150 SE/KRR 150SSR, Victor 150, Serpico 150/KRZ 150, ZSR Cyclone 150, Scorpion 150 (in Argentina) (Production year: 1989–2004 and 1996's–2015 for the Ninja 150R/SS in Indonesia) 2-stroke Engine (Marketed in the Philippines, Thailand ...
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.
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