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YAMAHA’S NEW TWO-STROKE YFZ250R?

-- It says YFZ250R right there on the gas tank and the engine certainly looks like a two-stroke. Is this a secret new prototype that Yamaha is testing and will start selling soon? That might be a logical assumption until you start looking closer at the engine. Hmmm, it says TRX on the clutch cover and the cylinder sure looks the same as that on Honda's 250R. Okay, the mystery is solved when J.D. Kimbrough provided us with some info about this quad. This is his 2005 Yamaha YFZ450. However, he took the four-stroke…