i just wanna thanks all that helped me answer some of my previous question (special thanks to Andy)

here is the story, this mc21 has been layed around the house for the pass 6 months (since i bought it in hongkong, oh, they sent me a wrong bike with broken fairing too), i cleaned out the carb, it started up but it automatically rerv itself till 10,000 rpm and stay there and wont shut down even when i turn off the key, until i shut down the gas.

so what can be the problem?

thanks