Re: A governor, or speed limiter,
Problem with limiting your throttle is you'd lose power everywhere, you'd cripple your low and mid range which you need to climb hills or take off. By limiting the RPM though the CDI signal you'd still have all the power just no top end speed.
Bet my buddy over at Michigan State could come up with something but that would mean giving up my engine and that ain't happening 'till winter. lol