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Hey Brad, I can send you over some of the info I have now, I don't think any of them are active on this forum. At 4300 RPM, that is a good cruise speed for the airframe.
Brad, are you in the process of getting this as your first engine for this plane? I am looking at this platform as well. You'll have to let us know how you like the double engine mount. I think it was a custom mount on the rotax mount.
I started out with a VW and ran into to many problems on the ground and never got to fly it with the VW. After 2+ years of delays due to the VW, I ordered the Viking 90 in May of 2019, installed it in April 2019. I have put 35 hours on the Viking 90 on my 701 since September of 2019.
It was easy to install and a complete setup including EFIS, Electrical system, fuel system all for less then just the Rotax 912 100hp motor alone would have cost. I've had a few issues, but nothing catestophic and Viking has been great about helping work out the issues and improving the setup.
The double engine mount is fine, although I think I may have squished the rubber mounts a bit too much last time I checked them. My only complaint with the mount is the right thrust is not built in. You will have to shim to get the right thrust or live without it.
Feel free to message me if you would like to talk more about it or have questions. I'm in South West Ohio if you are near by and want to stop in an see it in person.