Cowboy, I agree the 120 is obviously the right size for the 78" version of the Decathlon, but I think the Gentleman, earlier was inquiring about the 70" model.

I have the KMP Husky, still in the box, I was contemplating either a 91 Surpass or the 120????? The husky seems likes it's well built! Did you think it was a little heavy???? Your Husky looks sweet on those floats! I live at a lake, I think mine will end up on floats some day!

The problem, I've seen in many of these threads/forums, is that people try to shove absurdly large engines in models, only to have the model either shake itself apart or require extra weight to balance properly. Now, we also have the saying, "They all have a throttle!" pull it back!