Originally Posted by
Sunfish
So for example 4300 and 55% power is OK but I guess anything more than that power is a no no at that rpm.
The numbers are all governed by the Manifold Pressure. Agreed Sunfish, it is hard to work out and it's not clear on the Rotax website. Smarter people than yourself have also struggled to work out the best settings.
https://www.rotax-owner.com/pdf/ROAN%20FAQs.pdf
Given that you have sold yours, I wouldn't be losing sleep over it.
One of the biggest mistakes you can make is to fit a constant speed unit in the hope of a higher top-end speed at altitude. Simply put, it doesn't happen, unless you're turbo charged.