I ran my first clone race last year (been running modified and open classes) when a track was looking for more clone heavy karts. I borrowed a motor and got to the track to discover I was the only heavy there. Fine. Put me in mediums. We dont have any of those either? Then somebody is yelling to get out for hot laps. I jump in and run really well, passed most, and come off the track to find that was the clone light class. I switch to clone lights and was faster than most at 390#. Makes me wonder how much weight is really a disadvantage