You have too much fuel. We're not taking into consideration oil mixture, just the stuff that goes boom. Too much fuel= rich Too little fuel = lean. Technically, it will run better when you use less oil as there is more gasoline to burn, however, if your engine is new, don't bother with that right now. Oh yeah, back your oil mixture down to about 24:1. 16:1 is what the chinese use. We don't need that 'round here.