Without those primary sprocket figures you can't be accurate, but if you try and just extrapolate the difference for that tooth change on clutch drive ( the others say it uses the same primary chain) then I've got something like 3.183 total primary reduction for the 500.
Worth running that figure to see what you get perhaps.
If we assume the quoted primary reduction of 3.063 for the 550 is correct with 24 and 63 teeth on the clutch reduction then the primary chain reduction works out at 1.167 ((3.063*24)/63)
This then gives a total primary reduction for the 500 of (1.167*(64/23))=3.247
So finally in 5th gear and standard 17/34 sprocket set I get a total reduction of 3.247*0.9*2=5.845
So with my Avon 4.0/18 rear with a circumference of 82.9” giving 0.0013 miles per rear wheel rev I get (60000/5.845)*0.0013) miles per hour per 1000 rpm = 13.34 mph
So finally at 5000 rpm I get 5*13.34=66.7 mph
Feels about right to me
Conclusion
Without accurate data on the 500 primary chain reduction I make the total primary reduction for the 500 as 3.247 NOT the 2.0 stated in the Honda tech specs I have!!!!And finally just for fun for the 550 in 5th with a total reduction of (3.063*0.9*2)=5.513 and using same Avon tyres you get 14.148 mph per 1000 rpm i.e. 70.74 mph at 5,000
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