I'll do some research on the needle sizes when I get a chance (diameter, taper profiles, etc). That should help make some recommendations.
What you need to do is determine where you think the bike could be improved. Does it start and idle well? How is response off idle? Does it hesitate at all like its gasping, or burble a bit and then hit hard, or is it instant? Testing should be done under some load, 3rd gear. 1/4 throttle response, half throttle, and WOT. Same deal.
Easiest way is to take some tape and mark the throttle and housing. Mark a line across both with the throttle shut. Then again wide open (mark on throttle against housing). Fill in the gaps to index the points (1/4, 1/2, 3/4).
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