The Hirth 2702 and 2703 are a family of in-line twin cylinder, two stroke, carburetted aircraft engines designed for use on ultralight aircraft and especially two seat ultralight trainers, single seat gyrocopters, and small homebuilts.

[1][2][3][4] The 2703 was developed as a competitor to the 50 hp (37 kW) Rotax 503 and is similar to the Rotax powerplant in being a two-cylinder in-line engine, with dual capacitor discharge ignition.

[1][2] Both the 2702 and 2703 use free air or fan cooling, with Bing 34mm slide carburetors.

The cylinder walls are electrochemically coated with Nikasil.

[1][2][3] The engines runs on a 50:1 pre-mix of unleaded 93 octane auto fuel and oil.