The 2706 was developed as a competitor to the 64 hp (48 kW) Rotax 582 and is similar to the Rotax powerplant in being a two-cylinder in-line engine, with dual capacitor discharge ignition, although it is air-cooled, compared to the 582's liquid cooling. The 2704 was developed from the 2706 as a de-rated version to compete with the 50 hp (37 kW) Rotax 503.
Both the 2704 and 2706 use free air or fan cooling, with dual Bing 34mm slide carburetors or optionally fuel injection. The cylinder walls are electrochemically coated with Nikasil. Standard starting is recoil start with electric start as an option. The reduction drive system available is the G-50 gearbox, with reduction ratios of 2.16:1, 2.29:1, 2.59:1, 3.16:1, or 3.65:1.
Twin-cylinder in-line, two stroke, aircraft engine with a single or dual Bing 34mm slide carburetor or fuel injection. Produces 53 hp (40 kW) at 5500 rpm and has a factory rated TBO of 1200 hours. Still in production.
Twin-cylinder in-line, two stroke, aircraft engine with dual Bing 34mm slide carburetor or fuel injection. Produces 65 hp (48 kW) at 6200 rpm and has a factory rated TBO of 1000 hours. The 2706 was replaced in production in May 2002 by the Hirth 3203.