Byrons gen 2 is very ,very good. I can only speak from my experiences. I have used many different manufactures fuels and the only thing I can say is I have had less engine problems with Byrons. Bearings last longer and sometimes I would not even use after run oil(not recommended),and the engine would be fine on the next start-up. I tried that with another fuel and the motor would gum up. Myself and two other racers at my track had the same identical motors. Another racer and myself had premature rear bearing failures. The other guys motor was showing no sign of wear. We were using the same fuel and the other guy was not.We both replaced our rear bearings an switched to Byrons. We never looked back. BTW-that other guy's motor was still running strong 2 seasons later. Kenny Howard
Last edited by kmh; 10-16-2009 at 05:16 AM.