Rotax 618 with 3-1 ratio

[Dave F]

I would not worry about the degrees on the IVO.
Since the blades all adjust evenly just loosed the nut and play with it to get static RPM 6000 to 6500 rpm then try it and watch your EGTs.

I would be curious to see some pics of your exhaust set up on this Kitfox.

It sounds like you are close now and just tweak to keep EGTs in line at cruise.

[deejayel]

Here is a pic of my fwf

[Dave F]

interesting mounting.

Any idea is the pipe length has been changed from the OEM 618 muffler?

Looks like a 582 pipe.