V4 engine

A V4 engine has four cylinders arranged in two banks of two, set at an angle to each other to form a V. The angle varies by design; many motorcycle V4s use around 65 to 90 degrees. The engine is narrower than an inline four of similar capacity and has a short crankshaft.

V4s combine strong midrange torque with a high-revving top end and often a distinctive, uneven firing sound. Examples include the Honda VFR, Aprilia RSV4 and Tuono, and Ducati's Panigale V4 and Multistrada V4.

The downside is complexity: two cylinder heads and more camshafts mean higher manufacturing costs and more work during valve service. Follow the manufacturer's service intervals, as access to the rear cylinders can be time-consuming.