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These Dirt Bikes Are Some Of The Rarest In Existence
the company looked for opportunities to expand its horizons and saw opportunity after the introduction of Yamaha's first 400cc 4-stroke bike, a groundbreaking model for dirt bikes in 1997.
Could This Yamaha XE4 Electric Dirt Bike Take Over The Motocross World?
How was a 400cc class machine allowed to compete with 250cc class dirt bikes? The American Motorcycle Association (AMA) -- ...