whats the point of a big bore??? not to be a dick or anything but you probably cannot ride the 450 to its full potential... yeah yeah i know we already discussed about a bikes "POTENTIAL" but still? just a thought i had. Well, I guess there is no point really. My question to you would be why not? If I can afford it, and I enjoy trying different things, then why not? This is my 3rd 4-stroke and the 1st one that I have done anything to the motor on, who knows maybe I will hate it and put it back to stock. Right now with the whole 1.5 hrs. that I have on it, I am really liking the way it pulls off the bottom. I only ride and race for fun. For me tinkering with the bike is part of that fun.