Re: Throttle to ATV Style Thumb?
This was probably covered in some of the links Dave provided but to anyone planning on installing and using any type of throttle control make sure it has a spring return to idle. I've read where some guys have used click shifters which gave them "cruise control". That is a very bad, unsafe idea. In a panic situation you'll want that engine to slow down 'right now', not after you have to fiddle with some kind of mechanical release or detent.
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"