Right now I use pump gas but not opposed to changing it will make a difference with changes. I ride at 5,000 ft 95% of the time and its dune riding. Changing the jetting right now is not a problem because everything is apart while getting it bored. I am running stock carbs (TORS removed) and will be adavancing timing when it goes back together. It has FMF Gold Series Power core pipes. Hopefully that helps.