Static rpm may not give the exact EGTs or rpms for that matter when you are climbing out. When the prop unloads a bit, and revs go up, EGTs will likely go up some as well. If you have Rotax recomended jets for temp and altitude, you may have to go a bit flatter on the prop pitch. Verify that you are not getting any leakage past the primer if you have one, and that your float setting is not to high. Both of those could cause a richer mixture. I had the same engine and prop on my Kitfox 1 and it really performed. Can't remember what I had the prop set for on static rpm now though. Another thing, make sure your tach is accurate. Tiny tachs are good. The round 2 1/4" tachs are often not very accurate. Here is a link to a temp and altitude correction chart. And it's better to take it for a quick trip around the patch and find that yes it's to rich, then to find out it's to lean as you glide back to a landing with a cooked engine. JImChuk
Carb_Jet_Cht-2.jpg (847×1053) (challengers101.com)