I put 100 octane unleaded gas in my 450r cause I like the smell. When I would run hard into a corner and let off, it would seam to misfire on decel. I normally run Mobil 93 in it and it never does this. I have read on the forums that there is nothing wrong with running race gas. And the manual states run 93 or higher. What would cause this just out of couriosity. I am not going to run race fuel untill I bump up the compression. I was thinking that it could be the stock plug causing it.