The problem with selling your bike in Japan is...
1. You will lose the deposit you paid your carnet.
2. As far as I know, there is no procedure to transfer from temporary to permanent import except if the vehicle is inoperable and scrapped.
3. Registering a vehicle imported personally (as opposed to from a dealer) is very complicated and expensive. Not many people are willing to do it.
4. After Mongolia, your bike is most likely very beat up, so you won't get a good price anyways!
But, you are welcome to try. Maybe you will find a way that I have not ever heard of!
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