Irvine 40 ABC Mk IV (L-IRV5401) The Irvine engine range has evolved again, but this time theres a difference...the latest engines are now manufactured by O.S. to an Irvine design! By maintaining the successful design concept of its predecessor, the Irvine 40 ABC Mk IV keeps the Irvine tradition but incorporates new technology; a multi-layer, ringless piston/liner design, a simplified & lighter C40H carburettor
- which still provides accurate & progressive throttle response
- plus a modified & enhanced crankshaft. The bore / stroke ratio has been re-thought to gain maximum performance, & an upgraded silencer optimises the combination of power & noise. All these improvements are the result of ever-changing customer requirements & extensive testing, without sacrificing production quality; with O.S. manufacturing the engine & handling all production, you can be sure of that! Specification Capacity: 0.40cu. in. (6.47cc) Bore: 0.8" (20.5mm) Stroke: 0.77" (19.6mm) Weight: 14.2oz (403g) Power Output:1.4hp @ 16, 000rpm Practical rpm: 2, 000
- 17, 000