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Clews started building motocross bikes in his garage. Having no access to BSA works engines, Clews made his own extensive improvements to the standard BSA B50 500 cc engine, obtained by breaking up B50 MX bikes. His reputation grew as a builder of four-stroke motocross bikes that were capable of competing with the dominant two-stroke bikes.
The FIM Motocross World Championship is a worldwide motocross series sanctioned by the F.I.M. It was inaugurated in 1957 using a 500 cc engine displacement formula. [1] In 1962 a 250cc class was added and in 1975, a 125cc class was introduced.
A typical pit bike is usually a small dirt bike, but it has become common to be able to buy pit bikes with street-style wheels and tires. Pit bikes with street tires, as opposed to knobby tires, are used in Mini Supermoto Racing. [citation needed] Pit bikes are frequently heavily customized with decorative add-ons and performance-enhancing parts.
The TM400R was manufactured for the 1971 season and they signed Roger DeCoster in October 1970 to race it. The TM series included the TM 75, TM 100, TM 125, TM 250, and TM 400. These early Suzuki mx bikes are now collectable vintage machines, as well as very competitive in the pre-1974 classic scramble races.
These bikes have electric start, but are still considered race bikes, albeit for off-road rather than motocross. [5] Differences from the R models include lighting, electric start, suspension settings, engine and exhaust tuning for more low-end torque, larger fuel tanks, and a more rugged widespread ratio transmission.
MX racing bikes have often been used as platforms for building enduro bikes. [1] This was partially driven by the conversion of MX from 2-stroke to 4-stroke engine designs to comply with regulatory trends, as well as the development of hybrid competition races such as Enduro-X. [1] Compared to MX bikes, enduro and dual-sport bikes traditionally had a much higher proportion of 4-stroke motors.
In 2006, Brown finished 29th in the AMA MX Lites class and 15th in the MX class, racing for Suzuki. [7] In 2007, he returned to Europe to compete in the MX1-GP championship, finishing in seventh place. [8] After his motocross career, Brown began competing in Endurocross events. [2]
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