Sorry for the late response, but the 400 eats up a lot of power and I would be disappointed with the number. If it were a 6sp I'm sure it would make upper 800's on a dyno.
Hello all, I just found this forum since it seems like the first one that isn't all about racing or selling something. I have a Dino 293 Kart with a 5hp Briggs Raptor that I had built some years back. I want to dust it off and upgrade to an engine with more power. Any suggestions are welcomed...