Universal M-50B: Although it falls short of our 50-horsepower criterion, the M-50B, introduced in 1998 to meet the new EPA emission standards, merits a look from those shopping in that range. A Kubota engine marinized by Westerbeke, the clean-burning M-50B produces 42 horsepower at 2,800 rpm. The engine will appeal to cruising sailors looking for a quieter engine that operates efficiently at low rpm. Handy features include Westerbeke’s self-bleeding fuel system, a circuit breaker built into the starting system, and a built-in oil-sump pump. The fuel pump is a Bosch in-line model, and the fuel filter is the spin-on type. With virtually the same dimensions as its predecessor, the M-50, the M-50B is a suitable replacement for a wide range of engines, including the Westerbeke Four-99, Four-107, Four-108, W-40, and W-50. Universal is backed by Westerbeke’s wide distribution network. The company provides comprehensive service manuals and a variety of spare-parts kits for cruising.