I know this post is two years old, but I'm adding this to it in case someone else comes across this thread doing a search like I did.
I suggest to anyone seeing this to pay attention to the part On the PDF that says, Note the jet needles for the stock carburetor are to short and cannot be used in the big bore 44 mm carburetor.
I tried putting the nokk needle in one today and it was around 3/16 shorter. I knew right away it wasn't going to work. So I did a search for the carb and ran across this post and the PDF I pasted to this.