I have a complete Rotax Micro Max EVO upgrade kit available. We used it for about 4 months but our cylinder was not legal (too old) so we eventually just bought a new engine. I will also include several of the correct size jets. $500
I was looking for one of these forever and finally just paid $1400 for a new kit 2 weeks ago. Damn you. Lol, good luck. I might get this just to have a backup .