as far as jetting, you will be leanest at nite and richest during the heat of the day, also as the race goes on the air filter will collect more and more dust richening the bike. start the race with a new clutch basket and plates, it's been my experience that with a built motor endurance racing, the clutch will be the first thing to get tired, it wouldnt be a bad idea at around the 12 hour mark to do a major pit, check everything over, change the tranny oil and throw on a fresh airfilter. you will be doing a lot of nite riding, for lights the best bang for the buck will be a procomp 130 light with a rewound stator and a 55 watt bulb. carry a couple spare bulbs. next step up would be adding a rectifier, battery and an hid setup on the procomp. if you are still serious pm me..I will give you my number.