I don't think any sprocket change will increase your top speed. I saw 90 on my Rebel with stock sprockets, probably with a helping wind. 3 stripes a second is 90 mph, not reading the speedometer. I was passing everything since over 80 is reckless in Virginia and only a few dumusses are stupid enough to risk $500, 4 points and vehicle confiscation, even if you still owe money on the vehicle.
I went through the carbs 3 times to get them perfect and the orfices in the jets may have been slightly enlarged. No mods, jet changes or anything else, just taken apart, thoroughly cleaned and every orfice very carefully reamed.
You will not go that fast at altitudes significantly above sea level. While atmospheric density decreases, so does your engines effective compression. Increasing the compression is your best alternative, but if you go to sea level for extended riding you could cause top end engine damage without higher octane fuel.
regards
mech
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