Yamaha YZF-R1 Crossplane - Tsukuba Circuit

Sportbike heaven! Yamaha  YZF-R1 Crossplane doing a casual trackday in our beloved Tsukuba Circuit, among roadbikes that cover almost 3 decades of road biek evolution. Only in Japan.


A fine specimen of a Yamaha YZF-R1



Unlike in a V8, crossplane arrangement in inline-four engines results in unevenly distributed firing pattern, so the use tends to be limited to extremely high-revving engines, where the advantage of less secondary imbalance outweigh the irregular firing interval disadvantage (in addition to the rocking vibration disadvantages arising from plane imbalances on reciprocating mass and rotating mass, if not countered with a balance shaft). Please see engine balance article for details.

The 2009 Yamaha YZF-R1 motorcycle uses a crossplane crankshaft and use a balance shaft geared off the crankshaft at crankshaft speed to counter the inherent rocking vibration (primary rocking couples) described above.

A crossplane crank had been used in Yamaha's M1 MotoGP racing models in the past. Yamaha claims advances in metal forging technologies make this a practical consumer product.

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