Dirt Rider - - Tear Offs -

In my rac­ing days, long be­fore mo­tocross came upon the scene, we had three en­gine dis­place­ment classes in which we could race. They were 250cc, 500cc, and Open class. Today, we have 250cc and 450cc classes. Can any­one tell me how the 450cc class came about? It just seems log­i­cal to me that it should be 500cc in­stead of 450cc.

Ken Phipps Moxee, WA The rule book limit used to be 550cc, but when Doug Henry won the 1997 Las Ve­gas su­per­cross on the all-new YZM400, it kicked off the era of se­ri­ous four-stroke race­bikes. Yamaha and KTM fielded four-strokes, with dis­place­ments up to 540cc from KTM, while Yamaha upped its bike to 426cc. As those teams proved how good mod­ern four-strokes could be, and with other brands de­vel­op­ing their own bikes to join the party, the

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