Thanks ChinaV for taking the time to write such an informative post.
It would be awesome to be able to replace oil after 6-7k km but I recon its impossible on my bike. Even when I used most expensive 15w50 Motul oil, my bike started to complain at about 3-3.5k km, is Spectro oil really twice as good to double the intervals? . I My bike does run a little hotter then it used to. I probably am going to stick with changing the oil cooler though I noticed the way the tubes are attached to the engine is a bit funny and Ill have to find a way to attach the ones from taobao.
However, didnt have time to dwell on this much as am trying to sort out the legal issues. I hit the wall contacting customs about documents Id need to leave the country and enter again. Nobody seems to know in my little town, they are busy drinking their green tea and posting selfies on wechat.

Their is a friend of a friend in Urumuqi to whom Ill be sending tires and some other stuff. I remember reading on MCM that Urumuqi Yamaha center is nice and helpful so I will visit them for sure. I recon Ill need a check up after Mongolia.

Nice tip about the cables, Thanks.

@W3HS
Thanks for the info on carbs. YBR250 is fuel injected so no problems here. It does run like a 50cc scooter at around 3500-4000m ;)