My logic would be that I'd like to register in Fuyang, because that's where the bike will have it's home in a garage, ready for me to use.
Suppose, say, next year Fuyang have the great idea to ban motorbikes I would still be able to ride as I have Fuyang plates, while if I have a Anji plate I would have a real problem, a bike sitting in a garage that can't go out legally.

As for the 200cc limit I'm surprised as well, but Jialing nearest dealer (in XiaoShan) said is impossible to register anything above 200 cc either in XiaoShan or Fuyang, while Fuyang Yamaha dealer said it's no problem to register a YBR250.

I'n not sure why, it doesn't make any kind of logic to me, but since I live in China I stopped asking too many questions, to me the Yamaha dealer has connections while the Jialing dealer has no connection or can't be asked to embark in the hassle of registering a JH600.

I feel the dealer should solve the wenti, not me, that's their job, not mine. I found ridiculous the Jialing dealer saying he could sell me the bike, but
i would need to register on my own, as he said can't be done nearby.