The Dyno Jet Kit comes with: 420 mains which is 18 sizes up from stock (stock is 230), an adjustable jet needle (the stock needle has no notches in it to change the clip position), and shims so you can adjust the needle half a notch at a time.
I had to move the clip around a couple of times before I got it right, but this thing runs like stink now. No flat spot/surging/blubbering at low throttle settings like it had before. WOT is really stout. In first for second gear when it hits the pipes, the front end gets airborne in a hurry.
I still need to do a plug chop to see if the mains are right, but it feels really good like it is, so I expect they are fine. Starts easy, idles smooth, and getting under way from a stop is smooth and easy.
This is a really fun bike to ride becsue it is so small and light and handles so well. I plan to pull the forks off and install new seals as one of them is leaking, change the steering head bearings to roller bearings, etc.

Wayne