Hey guys, I feel it is always important to search the specifics on the engine itself, mine calls for 16:1 for the first two tanks, and 32:1 after that. But also that is for regular use. If you plan on modifying the motor to be high performance, I recomend a ratio with a bit, bit, BIT. More oil, to counter act the extra heat and stress. I hope this helped. Plus, be good to your bike, spend a little extra for premium gas, and premium oil. The guys I know who are always saying, "man, these China motors suck"... they are the guy who don't get the little extras. I get HD studs, mounts, etc. treat your engine like you care, and logic dictates it will obviously last longer, and run stronger.