“Weight is a factor in acceleration (F= m x a) but not in top speed.”
Mechanical engineers know otherwise.
Weight affects bearings, suspension loading and vehicle aerodynamics, tire drag, etc.
Besides f=1/2mV^2 is the more accurate equation to worry about.
I did not bother to mention minor effects such as bearing friction, etc. A one line comment is not intended to be a scientific treatise.
To repeat or clarify: The predominant top speed factor for a given power is aerodynamic drag, not weight. The power required to overcome drag increases with the CUBE of velocity (while the weight remains the same). The rest is insignificant in relation to that.
(And kinetic energy is irrelevant to this topic.)