Just to give you a run down on my 79cc, I first removed not bypassed as some do the governor, and installed the ARC billet flywheel, and upgraded the springs to 18 lb springs, now I'm turning the rpm's, but still wanted more out of the little predator, so I went with a header pipe and a nibbi 19mm race carb, still hungry for more power last but the best upgrade I did was shaved head 50 thousands and ported both ports and polished exhaust port, and that last upgrade was my best power gain, now I'm happy with it.