This video explains what a crossplane crankshaft is, how it differs from the common flat-plane inline-four, and why Yamaha introduced it on the 2009 R1. It covers engine balance (primary and secondary ...
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Secondary engine balance - explained
What are secondary engine forces? How do you balance secondary forces? This video explains secondary forces, which are forces that occur twice per revolution of the crankshaft. Secondary imbalance is ...
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