I'll start by making a record of the changes i have made to the bike FMF 4.1 mega bomb pipe ported the head jd jet kit twin air filter and removed the screen airforce moto tassinari air boot currently running a mix of aviation fuel (100LL) and premium 3 gals avgas to 1 gal premium jetting currently 182 mj RED needle 5th position 50 leak jet 2 turns on fuel screw pilot jet unknown at the moment the bike is ridden primarily at 500-1500 feet at 50-80 degrees My problem is that the bike runs hard at 0-1/8 of throttle (probably pilot) However the BIG issue is that under load (soft sand or g outs or getting close to over rev while airborne) the bike will bog down hard or run really hard and start cutting out. At a local track this weekend I had the biggest issues when dropping off a single jump to flat bottom. All last year I had issues with the bike falling flat on its face coming out of corners and bogging out while using the throttle in the air. Since porting the head this winter I have had to move from a main jet of 185 to 182 and i've changed the accelerator pump screw multiple times and i think its in the most effective position. Running the bike through the gears and to full throttle the bike feels good its only once on the track during load does it start to have issues. To be honest all the issues started when i put the Airforce boot on, but I don't want to take it off because it was a lot of money and there is a power gain while its on. Would a Quickshot 3 be a good idea? Should I run different gas? Should I get a different ignition system? Any advise would be great. My local shop owner is tired of me stopping in every day.