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Four new 2-cylinder 4-stroke concepts are displayed as design and fitted in vehicles. These four different concepts comprise a Modular Concept V2- and W3-cylinder a MotoGP / Superbike concept with 2 and 3 cylinders, a narrow angle V-engine and a Building Block System Commuter CVT engine. Each engine concept is designed to meet the different requirements of the four segments. Specific analysis and simulation concerning 1D thermodynamics, vehicle simulation and delivered performance and tractive force was done for each concept. The concepts are compared in the aspects of uniform rotation, inertia forces and moments, and the effect on performance by the pulse effects of the manifolded intake and exhaust systems. The Modular Concept contains an OHC engine with a wide range of displacements and commonality of many parts. Good versatility is obtained as the concepts can be applied for sport- or custom bikes.