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If you want to spend the time and cash it not hard to make one go that fast .They have been built to do more that that. I see no reason to but they is why they invented Harley so we can do what ever we want.
Have you ever even looked at what these folks do with the Vtwin . Not your run of the mill so called builders they make it do what ever you want. http://www.rbracing-rsr.com/113orca.htm
The factory control module and rev limiter on my Ultra would feather out the throttle right at that speed. So maybe a theoretical 147? Well, only theoretical. Mine has had some work but still runs out of torque to overcome air pressure and stuff before that anyway. That's fine!!!
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