Anyone ever used a Geo engine before? I talked with a guy some years ago that had the 4 cyl. on a CH-701. He said it was comparable to a Rotax 912 and the 3 cyl. models were used on a lot of smaller ultralights and light sport aircraft. CGS Hawks, etc. Raven Redrives, if they're still in business has complete engines or you can buy the instruction CD on how to convert one. Seems like a good fit for a LE, DE or CE.