The Banshee actually will hit harder than your 250. Stock it has a little less horsepower, but it has a real hard hit. Pipe it and you will be around the hp of a 250.
That's a sweet lookin quad you've got there! I bet it flies
I realy like Klotz R-50 and so do my bikes. I usually mix 40:1, but when I do high speed WOT riding I sometimes mix it 32:1.