The Hirth F-263 is a twin cylinder, in-line, two stroke, carburetted aircraft engine that was designed for use on ultralight aircraft.
[1] The F-263 uses fan cooling and piston-ported induction, with a single Bing carburetor and single capacitor discharge ignition.
The cylinder walls are electrochemically coated with Nikasil.
A gearbox reduction drive system and electric start were factory options.
[1] The engine produces 31 hp (23 kW) and runs on a 50:1 pre-mix of unleaded 93 octane auto fuel and oil.