The two-cycle Rotax really drinks fuel. I have a 582 in my Renegade, and it burns 5 1/2 gallons an hour. What you save in engine weight you more than make up for in fuel and fuel tank weight. Also, their life is short compared to four cycles.
The Rotax four-cycles are good engines, but require a gearbox and a big bank account. One ready to hang on your plane goes for about what most guys are putting into their entire KR with an engine. Jim Vance va...@claflinwildcats.com