Quad bike hand throttle

[ED.D]

Anyone know of a retro fit hand throttle for a quad to help with constant speed for spraying and seeding applications?
thanks.

 

[Jasper]

Some have an adjustable screw so you can’t rev it to hard . I used to set it for the kids so it wouldn’t go to fast but it would give you a constant speed

 

[Mounty]

Thats what we use on Can Ams for towing a trailed implement that needs max speed of 8mph