Rich, I have a question. I have a Powroll stroker motor in my DRZ125L. I mated a 24mm carb to it and it is jetted right on the edge. If my wife rides it, the plug is perfect, even on sand tracks. When I jump on it all is good until I burn about 10 laps chasing the 80 riders around then it develops a slight bog. I haven't noticed any detonation, but the plug reads lean. I'm currently running C-12. Is there another fuel that would bump me just a little closer to the rich side? I'm being lazy and trying to avoid constantly changing jets since we both ride the bike. I thought you once mentioned AV gas as a good choice when you are tuning on the edge because it remains in a liquid state as it enters the combustion chamber. I'm wondering about a blend of 25% AV gas and C-12?
Let me have it.