The F-23 is intended to compete with the
Rotax 503 and is differentiated from the
Rotax powerplant by offering a horizontally opposed cylinder layout. The F-23 uses free air cooling and piston-ported induction, with dual Bing 34mm slide or optional diaphragm type carburetors. The cylinder walls are electrochemically coated with
Nikasil. Standard starting is
recoil start. A belt reduction drive system,
fuel injection, tuned exhaust and electric start are optional. The engine runs on a 50:1 pre-mix of
unleaded 93 octane auto fuel and oil. Recommended time between overhauls is 1000 hours. The F-23 produces at 6150 rpm and at 5500 rpm. ==Applications==