T25 but with the security hole/pin deal. I picked mine up at Advanced Auto Parts, really not a fan of that place but they had what I needed for ~$12 in a small set of security torx bits.
Or are you asking screw length & thread type? I'm not sure on that.
Thats exactly what I wanted to know, thank you very much. I was going to take a set of carbs I have kicking around to town after work today and try sizes till I found the right one but this makes it much simpler. I'd rather buy one screwdriver than a whole set I know I'll never use.