To Lancer’s point, you want genuine Mikuni jets for the stock CV carb or if you switch to a Mikuni VM36 slide carb. Lancer sells a VM36 carb kit and also genuine Mikuni jets for either carb. As well as his other goodies - hot cams and pistons.
The 6sigma website is a bit of a black box. Even when I added the stage 1 kit to my cart (playing around with them), it didn’t tell me what I would get for $50+ bucks. No thanks.
If you don’t want to buy through Lancer, you can buy genuine Mikuni jets from JetsRUs.com. They are like $5-$8 each and like $8 shipping. That’s much better than a $50 kit that you don’t know what you’re getting. They also have the “washer/spacers” for the needle, or you can get a half-dozen of the right sized washers at a hardware store for less than $1.
The Mikuni VM36 is a great carb. Lancer and his followers can attest and he’s sold many to happy members. I like the VM36 a lot. I also like the Keihin PWK38 a lot. The biggest difference when running a slide carburetor is throttle response.
DragBikeMike did a great “carburetor shootout” technical post comparing several carbs. Link here —>
http://suzukisavage.com/cgi-bin/YaBB.pl?num=1585461605