Simonini Mini 4
The Simonini Mini 4 is an Italian aircraft engine, designed and produced by Simonini Racing of San Dalmazio di Serramazzoni for use in ultralight aircraft. Design and development
The Mini 4 is a single cylinder two-stroke, air-cooled, petrol engine design, with a poly V belt reduction drive with reduction ratios of 2.56:1 and 2.78:1. It employs capacitor discharge ignition electronic ignition and produces  at 7200 rpm. Specifications (Mini 4)

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Air-cooled aircraft piston engines
Simonini aircraft engines
Two-stroke aircraft piston engines