Sport Rider Photos
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The R1's crossplane crank spaces each cylinder 90 degrees from the next. This layout gives perfect primary and secondary balance, but a counter rotating shaft is required to offset a primary rocking couple. A conventional 180-degree spacing has no primary rocking couple but is not balanced for secondary vibrations, hence the need on some bikes for a balance shaft spinning at twice crankshaft speed.
2009 Yamaha YZF R1 Crank Spaces