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When I was riding the 500 delivered to Grand Junction's dealership on the highway at WOT with no grade it never went above 82 MPH. (laying on tank) Downhill it did hit 89 MPH. (Laying on tank toes tucked and knees slammed to the engine and air cleaner.

While top speed on a dyno maybe 110, at a point you are fighting as much resistive drag and turbulence as the HP can overcome.
 

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The maximum possible speed obtainable is achieved by riding off of a very high cliff to determine terminal (and I mean terminal literally) velocity. This should only be attempted by trained professionals on a closed course. LOL

31.7 feet per second per second.
 
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