I just installed an Evo 26 in my Funtana 90 and it is an excellent engine but need to find a light muffler since the Pitts muffler is large and heavy.
The advertisied HP is nine/tenths more than the Roto 25. Don't know why the difference.
It only has maybe 20% of the vibration that the Saito 150 had.
It ran for 44 minutes on the stock 17 ounce tank that came with the Funtana 90 and am converting to a 10 Ounce tank which should give me at least 20 minutes flying and reduce the nose weight by 7 ounces.
While it is 4 ounces less than the Saito 150, the muffler adds a lot of weight and ends up weighing more than the Saito because of the muffler.
Looking for a lighter muffler, pipe or whatever.
3dbob