well it started out as a good engine for me but less than 10 tanks it broke something inside....possible crank or rod. Waiting for Ofna to possibly replace it since it less than 2 months old and just broken in or shall I say broken. Ofna says they may replace it or they may charge me $50 for a rebuild which I say is BS since I had tuning issues from the start and barely went past half throttle when it locked up on me.
However the very few minutes I had it running which was not too many, the engine screamed really fast. Definitely more faster than the previous Sirio 18 I had on the Maxx.
If Ofna does not honor a replacement for defective parts, then I may just dump a cheap engine in it and put it up for sale. Besides, I have dumped plenty into the Maxx and have had nothing but bad voodoo towards it.
Good luck with whatever engine you choose for your Maxx.