Always start on the fat side, plugs are cheaper than pistons. You have to do a little research to learn about the process, even the Clmers manual has a section and a good diagram showing which circut affects which throttle opening. You could have two supposedly identical banshees sitting side by side and they might tune slightly different.
Read that stickied thread "What jets are you running" Find a set-up simular and use it as starting point. My set-up: Unported 4mil, head spacer, FMF golds, +4 timing key. 310, 27.5 , 3rd notch, 1 1/2 turns. 900' , 80 *f