I had a Kitfox 1 that I sold several years ago. Performed great with a 582. A buddy of mine is flying a Sky Raider 2 with the HKS in it, and it's doing very good for him. I've always thought that if the plane is light, the HKS would be fine. Very early HKS engine had a factory recall, not all of them got sent back. If you google it, you will see what serial # applies to that recall. More like a 503 than a 582 for power from what I've heard though. JImChuk