As you specify that you have an American Lifan LF200GY-7 we assume that you're located in the USA. Of course you can contact Lifan Thailand, but you will find that buying your parts in Thailand and shipping them to the USA is not so cost efficient.
The best thing you can do is to contact Lifan in the USA, or one of Lifan Parts distributors in the USA.
First Lifan America can be contacted by telephone at 1-855-543-2687 or (951) 685-1748 (Pacific Time), and you can contact Hooper Imports/Exports at Larry Hooper-425-445-1608 (Pacific Time)