My 21 came with a 42T rear. I use the bike mainly on the street, including long, straight highway portions (ideal for seizing) and occasionally may hit a track, but not more often than once a year.
I've always felt it is a big sprocket specially after doing the wire splice. The engine easily reaches red line in 6th even uphill.
I have now sealed exhaust, a fresh top end (in the post), and a set of main jets for airbox mod.
I am trying to decide between a 16 front, std 40 rear or something smaller, but again have no experience. I've read about the 16 being tight in the cases.
Has anybody gone through this selection process?
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