[efhughes3]

Originally posted by kach22i
Air-Cooled, way to go.

The 503 is used on a lot of small hovercraft too. It would be a nice upgrade for me.

The Rotax motors are about as bullet-proof as a 911 six. They like high R's, and are trouble-free with proper maintenance. I had the single carb, dual ignition which was more than enough power for me to cruise at 70mph at 85% throttle.