I'd skip the kits.
As said just yank the cap that covers the idle mix screw and set it to about 2.5 turns (stock is like 1.5).
Stock pilot jet is fine. 31 is stock, some people put a 34 in, IMO unnecessary. The stock jet can deliver plenty of fuel with the mix screw further open.
Swap the main with a #130 (stock is 126)
That's for a typical, under 3k elevation bike. Higher altitudes often find the stock jetting is close to ideal. You can drill out the CV slide or cut the spring down if you want, ehh, I'm not really convinced either has much effect. This is a mild mannered motor, it's never going to have the "snap" response of a modern 250 motocross bike or anything. Some people also mess around with shimming the needle, again, I'm not convinced this has any performance merit and hits MPG/range.
Feel free to add a slip on down the road, really no changes will be needed. I even did the Wiseco piston and stage 1 cam, and still the jetting seemed pretty much bang on. Just minor adjustment to the idle mix.
It's a Teikei carb, which uses the name numbering system as Keihin (so if you have a Keihin #130 hanging around thats perfectly fine). Dynojet and Mikuni jets are not interchangeable (number for number at least although physically they fit fine).