I have my BCMA 40cc in a Goldberg Extra 330, which is about 12.5-13 lbs. Initially, when it was first breaking in, it would hover and pull out but slowly. Now, however, since I have put about 2 1/2 gallons of fuel through it, it pulls the plane out with some serious authority. I can hover at about 1/2 throttle, and when I hit full, it just goes and goes.

The best part about breaking these engines in is that you just go out and fly to do it!

It would be a great match for your Katana, good luck.