People ask me this question all the time. Should I run race fuel or pump gas. You will loose power on your bike if you run race fuel on a low compression engine. Race fuel has a slow burn rate and needs lots of compression and a different ignition timing to get the benefits from it. I have done several tests on different fuels and seen huge power drops on my own engines. We where trying to eliminate all possibility’s during testing a few years back. One test on fuel dropped the bike down 10hp and even when we pulled the timing out it was still down 8hp. When your spark plugs rattle loose, it’s from detonation, back your timing off -2