Brian, I'm using a K & N filter on the 582 Rotax on my Renegade. I started losing power with a commensurate decrease in exhaust gas and cylinder head temperatures. Then I started experiencing "hiccups". It turned out to be the filter. It looked perfectly clean, but the oil had congealed to where it was severely restricting the air flow, and I was running more than rich.
Try cleaning and re-oiling your air filter. It might make your problem go away. Please let us know what you do find: it may make it easier for one of us to solve a similar problem in the future. Jim Vance va...@claflinwildcats.com