The Zenoah G-25 is a single cylinder, two stroke, carburetted aircraft engine, with optional fuel injection, designed for use on ultralight aircraft[1][2] The Zenoah G-25 is equipped with single capacitor discharge ignition and a single Mikuni slide-type carburetor.
It is equipped with a recoil starter system or optionally electric start and a 2.5 or 2.8:1 belt reduction drive.
[1][2][3] The engine runs on a mixture of unleaded auto fuel and oil.
[1][2] Producing 22 hp (16 kW) at 6600 rpm, the G-25 competed in the early 1980s ultralight powerplant market against the similar Rotax 277.
[1][2] Data from Cliche & Tennessee Propellers[1][2]