Been there, done that. I just installed a new carb of my bike today. I broke the Zipty needle off in my carb, couldn't get it out, sent it to Zipty and they sent it to their "carb expert" He got the piece out but the bike never idled right again and I finally had to get a new carb. You CANNOT buy a throttle body, you have to buy the whole carb.. Yamaha
price $855.00 (Pain). You might be able to get a honda
crf 450 carb for quite a bit less than that and adapt it. I contacted kehin and they advised me right away that the chance of getting the piece out without damaging the carb were very small and they were right. Drilling, welding etc are out because it's not accesable. And the hole is a taper which must be perfect. I'm sorry to be the bearer of bad news but that's the story, I suggest just biting the bullet and getting the new carb, it'll save you a lot of grief and you'll end up doing it anyway.. I must editorialize here though and say that ZipTy racing is really lame on this, Aluminum, especially anodized is not the right material for that part and they are partially responsible for this problem.. But by God, they got paid for their crummy part..The fuel needle is just too small for aluminum. a lot of them worked but the price of failure is high for the buyer..Any new readers who are thinking of a adjustable fuel screw should look for a brass one and save themself a lot of grief.. Big Jim "WR450F with CRF450 carb installed"