I brought it to them with a 27.5 pilot and a 420 main. Ended up with a 22.5 out about 1/2 turn ( lost the 25 pilot in all my failed attempts changing things). I hadn't a clue what I was doing. They explained the slide adjustment to me and the air screw.
This is my first 2 stroke machine 
Though I kicked it over easy before the airbox mod they explained the sweet spot to me. Back to a couple kicks.