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  2. AMA Motocross Championship - Wikipedia

    en.wikipedia.org/wiki/AMA_Motocross_Championship

    By 1994, the displacement limit of a four-stroke power motocross bike was up to 550 cc in the 250 class, to incentivize manufactures to further develop the design for use in motocross. [8] In 2006, the 250 cc division was renamed the MX Class, with an engine formula allowing for 150–250 cc two-stroke or 250–450 cc four-stroke machines. [9]

  3. 2024 AMA National Motocross Championship - Wikipedia

    en.wikipedia.org/wiki/2024_AMA_National...

    The 2024 AMA Motocross Championship season is the 53rd AMA Motocross National Championship season, the premier motocross series in USA. Jett Lawrence goes into the season as the defending champion in the 450 class, after winning every race on the way to title in 2023 .

  4. American Historic Racing Motorcycle Association - Wikipedia

    en.wikipedia.org/wiki/American_Historic_Racing...

    AHRMA offers vintage National and regional road racing, motocross, dirt track, observed trials and cross country competition. The classic machines active in AHRMA events span a full 70 years, from the 1920s to the early-’90s. The national-championship schedule typically includes at least 15 rounds in each competition discipline.

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  6. AMA Supercross Championship - Wikipedia

    en.wikipedia.org/wiki/AMA_Supercross_Championship

    The event that paved the way for constructed, stadium-based motocross events was a 1972 race held in the Los Angeles Memorial Coliseum, promoted by Mike Goodwin and Terry Tiernan, then-president of the AMA, and won by 16-year-old Marty Tripes. [5] [6] It was billed as the "Super Bowl of Motocross" which led to the coining of the term ...

  7. 2025 SuperMotocross World Championship - Wikipedia

    en.wikipedia.org/wiki/2025_SuperMotocross_World...

    Combining the AMA Supercross Championship and the AMA Motocross Championship, along with three final SuperMotocross rounds, the total length of the series will run from January to September. [ 1 ] Jett Lawrence goes into the season as the reigning overall champion in the 450cc class, whilst Haiden Deegan begins the campaign as the defending ...

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  9. Ernesto Fonseca - Wikipedia

    en.wikipedia.org/wiki/Ernesto_Fonseca

    Fonseca kept a busy schedule competing in winter Olympics and Loretta Lynn's amateur motocross championships where he met his long-time friend Ricky Carmichael. In 1999, Phil Alderton and Erik Kehoe of Yamaha of Troy would hire him to race the AMA Supercross Series East. It was just matter of time for Fonseca to step up to AMA motocross.