These are Go based. I've been looking into the Go's quite a bit lately. I know the US distributors are selling Go's with the short needle conversion already but I think these still come with the long. If you do some research you'll find that in many country's people prefer the long for better run time and more throttle "feel". When I was asking about the Go's one of the NZ sellers gave me an awesome tuning guide helping with the differences in short vs long needle. It was such a good explanation I asked him to post it on the tuning bible and he did. It's by grizz and is on the last or next to last page of the bible. He also has alot of info under tech tips at his site that are very easy to understand.
http://redirectingat.com/?id=42X1295...hread-776.html Check this site out if your unsure about the long needle it will straighten you out!