Dont know if anyone allredy came up with this idea so i though i would share it.
Found the throttle return spring to be way to stiff on my CB500 -74 and came up with this easy fix (yes, i have new cables and all that).
It reduced the force needed with at least 50% and there are plenty of spring left to close on its own and now it feels like every other bike iv ever owned.
And the best part, it was free.