four-stroke Exemption rule

Today, only Yamaha and the KTM Group still make competitive motocross two-strokes. Honda gave in 2007. Suzuki quit in 2008 & Kawasaki’s final run of 250 two-strokes petered out in 2007,
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With the 2023 Supercross series just a couple days away, we have to asked, do you remember when Lance Smail, Tom Moen and KTM 540SX made Supercross history
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Have you ever heard of the ""AMA Four-Stroke Exemption Rule?" Well, you can forget it1
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