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Rob,
I've got an 03 T100 as well and had exactly the same experience looking for 6th at highway speed. I went to 18T and it effectively gave me the 6th gear I was looking for. I'd never go back to 17T.
I can also confirm Shorty's estimate of 70mph at 4000rpm with19T. I do about 65mph at 4000 rpm with the 18T. Its also dirt cheap. If you have the socket for 1 7/16" sprocket nut you'll only spend $20 plus shipping for the part from newbonnie.com. The socket and 3/4" drive adapter to go with will run another $15 or so. Nothing else you do to your bike will deliver the additional performance for the cost & time involved. Just do it babe.
Folks on this site have step by step instructions for how to do the mod (Captdon?). You can't go wrong.
FYI the 865cc bonnies now come with the 18T stock. Maybe the 17T sprocket is good for UK riders doing a lot of city or low speed riding, but for Americans on the 75-85 mph interstates and parkways, we need the 18T at least.
Pete
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