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A V-twin is a two cylinder internal combustion engine where the cylinders are arranged in a V configuration.
This arrangement is common on motorcycles, the engine can be mounted in transversal position like on Harley-Davidsons, Ducatis and many recent Japanese motorcycles. The longitudinal V-twin as seen on Moto-Guzzis and some Hondas is less common. This position is well adapted to its transmission shafting, but has the disadvantage of causing a torque reaction that tend to lean the motorcycle on the side.
The most obvious configuration for a V-twin is a 90° angle, but others angle can be seen like the 45° Harley-Davidson, the 75° Suzuki and the 60° Aprilia.
A 90° V-twin can achieve perfect primary balance but has some secondary imbalance. The 90° V-twin should be viewed as an alternative to the flat-twin configuration. The flat-twin is perfectly balanced.
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