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As I have written in What documents are required to drive a motorcycle from Kazakhstan to China? you need a guide and plenty of paperwork to get a vehicle into China. Much of this paperwork is to ensure you don't import the vehicle but that it leaves China again after your trip. This does not change for a motorcycle as in What documents are required to drive a motorcycle from Kazakhstan to China?
For a throw-away bike as you intend that is not worth the trouble, as we are talking thousands of USD here. Also abandoning the bike in China would not go well with the authorities upon your exit from the country.