Here is a link to the needle chart
http://www.jetsrus.com/a_jets_by_carburetor_type/needle_mikuni.html
this doesnt help
the TZ needle i have is a 6F13-62
the 6F13 is represented on the list (sadly the 6N11 range isn't to find a match, can someone post that?) with dimensions that are nothing like my needle which measures as follows:
A-68
B-30
D1-3.10
D2-2.65
D3-2.65
D4-2.40
D5-2.05
D6-1.75
if you want to run unleaded and use a TZ needle i would match that up, remember by altering what you choose off the chart as you clip position you can get closer, your choice of mains can also take up any slack at the last 10-15mm of the needle. if you match this up you will need R6 needle jets
regards your last post, they are also not available, sadly.