you can get the info at agk.com my problem is that i dont have a numbered drill bit set and if i go too far im done. which actually is exactly why i had to put the sheng wey on. i went too far with the stock carb not only in jet but bore size and i had that carb on another bike so i combined the 2. which actually worked pretty well once i got the manifold i built sealed. also i couldnt get that site to work