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Understanding Bore and Stroke
By Tim Dickson on 05/11/2010 16:38:16
Your engine's bore and stroke dimensions play a vital part in the way it produces power. Here's how
often. So that's what Yamaha chose to do with their '04 R1, reducing the stroke by 4.4mm and adding 3mm to the bore. Last year's R1 redlined at 11,750rpm. This year's redlines at 13,750, and makes its peak power 2000rpm further up the scale.At that 13,750
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