I put a 66cc skyhawk on a trek 970, an old but good bike and have ridden it for a year. I go 14 miles round trip to work each day. For me this is fun and a hobby. I am interested in getting more out of this motor. I have found the oil to gas mix ratio to be way wrong for my bike if I follow the 26to1 ratio. I have stalls and plug fouls. I am interested in what you guys do and some cost effective upgrades. I am interested in a better exhaust, and carb. Hi all!!! Additionally, I am retired AF, work for the city. Any one got recomendations about a carb or exhaust?