MCN - Motorcycle News Posted January 6, 2012 Report Share Posted January 6, 2012 A decade ago Yamaha led the four-stroke revolution in dirt bikes. By taking its high-revving, R1-style, five-valve technology and applying it, first in motocross with the YZ400F, then enduro with the WR400F and massively successful WR250F, the Japanese firm rode...More... Quote Link to comment Share on other sites More sharing options...
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