I am still trying to grasp the concept. (in my pea sized brain) LOL All of a sudden the light bulb will come on and I'll yell "Now I get it" LOL I haven't looked but too bad there isn't some videos to show the mixture path through the intake, into the head, chamber, and out the exhaust and what modifications do for the flow in positive and negative ways. One of you guys mentioned the short radius and how you feel it with a finger and can tell if it's good ot not. Now you got me doing it! LOL