hey. i have the same bike, i have had the same problem. i did all you did. here was my solution. my throttle cable needed cleaning and relubing it stuck try using liquid wrench dry lubewith PFTE (Home Depot $7). however when i tried it with the newly lubed cable it still stuck...$%*&!!! The throttle is indirectly linked with the automatic oil mixer on top of the case. this will get gummed with crap... clean it and lube it's cable too This may solve your woes. SMooTHE SAIling KId!