Sorry Rex, been busy for sure but did get to run the engine and mess around a bit with it in my buggy. The engine is VERY smooth...so smooth that I was messing with the needles too much trying to get more out of the bottom. Mid to top is outrageous with the matching 2058 pipe (same as the werks). Fairly easy to tune and break in went simple enough. This is a great buggy engine for a loose track imho. A little too soft for my liking in truggy but didn't get to try a 2013 on it. Not sure what Orion CRF engine this matches though.
Again, apologize for the late feedback..I have since donated the engine to a fellow racer who was in need of another engine...He really loves it in his buggy, coming from a mito7. Said its really smooth and easier to drive.