Main Motorcycle: 2009 Bonneville SE
Join Date: Jun 2009
Location: Asturias, Spain
Other Motorcycle: Yamaha XV1100
Extra Motorcycle: Qingqi QM200GY-BA
I think a thumb throttle would still be tiring to operate, and you would probably have to discard the return or push cable.
I would seriously consider removal of the throttle return spring and keeping the throttle cables, drum and housing well lubricated.
I tried a bike without throttle return springs once, and was amazed at how smooth, light and controllable the throttle became and how slick the gearshifting was.
You could also fit a much lighter spring to effect a measure of self closing. We have the kill switch to deal with possible emergencies arising from a stuck throttle anyway, as well as positive closing with the existing twin cable system. It sounds reckless but might be worth trying.
Last edited by Forchetto; 08-03-2013 at 03:58 PM.