MCN - Motorcycle News Posted January 29, 2008 Report Share Posted January 29, 2008 Yamaha?s latest R1 features new-found midrange drive from junking Yamaha?s tried and tested five-valve per cylinder in favour of the traditional four-valve set up, but at the same time installing some of the ?bad boy? engine manners the original model...More... Quote Link to comment Share on other sites More sharing options...
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