For off-road use, the recommended jetting for your KTM is: 48 pilot, NOZE needle on the 4th clip, 170 main and air screw set at 1 turn out. In cold weather use the NOZD needle and a 172 main. While richer jetting will help your engine operate cooler, there is also a fine line between throttle response and fouling plugs. To help preserve your engine I would recommend installing a radiator fan to keep operating temperatures down, similar to the one Ryan Dungey uses on his factory KTM. It is also especially important to keep small engines well lubricated so be sure you increase your fuel mixture ratio from the stock 60:1 to between 32 and 40:1. It is not uncommon for professional racers to run their engines at 20:1 because they use them so hard.