never tried it on a quad before, but I've used it many times on cars, and can say from experience that stuff works! It works really well if you pour about half a can in the gas tank and then take the vaccume line off the brake booster and then start pouring the rest of the can down the vaccume line directly into the intake till the car starts to die then plug the line with your thumb till the car idles back up and then repeat till it's all gone.(The car will smoke a lot during thisbut thats good its the carbon being cleaned out) once you have done that turn the car off and let it set for about 10 min and then fire it up and drive it. It will smoke a lot at first but then it will clear up and with in a couple of min it will have a noticable boost in power (assuming the car had carbon deposits robbing power in the first place)