I had the same problem with my throttle as well. I took the housing apart that connected to the throttle and found chunks of silicone or something that were sprayed in there. I cleaned them out, cleaned off the old grease, regreased it with new good stuff, made sure everything was in the grooves properly, and everything worked fine from there. Pretty much dissassemble, clean, and reassemble it.

Not sure how much it'll apply to your bike, but I figured I'd try to offer ya some help. Good luck with it. Glad to see you started with something sensible to learn on.