I don't know whether it redlines in 4th...I have only just fitted a rev counter anyway.Mine is 790 BA. Certainly in 3rd I have had it up to about 6500 and its flying. I think people need to be reminded these bikes were not designed as rocket machines for pulling 6g's they are stylish retro cruisers to be ridden in a different way...thats why I got the 19t.
Regards
Steve