Whats your elevation? what temps do you plan on riding in? All these come into factor. I have my bike jetted for summer 60-75 degrees. My elevation is around 1500 to 2000 feet. I have the Fattys, K&N, Radvalves. (Advanced timing you may need to richen your main) I have a 260 main, i think the pilot is 1 size larger than the stock 27.5 one, my needle is moved to the 4th position, and turn my air screw about 2 turns out.