I've got a ported 240 (at 73mm), Hot Rods +4mm crank, V4 reeds Lectron carb, custom made pipe and a rechambered head with I believe a 28cc chamber. I cut the head a couple years ago and wrote the chamber size on it but can't read it now. But I believe my C/R is to high. I've got it apart now and I'm ready to cut it again. What C/R range works best for pump gas and hard riding?