My first QM200 originally belonged to CrazyCarl and then I passed it on to Bryce, it's now in the hands of Supersignet. Bike has held up well with all the abuse, I guess about 20,000 kilometers so far. If you find a good deal on a QM200, I would suggest the following.

520 Chain and Sprockets (most stock QM200s' have 428 which is junk).
Higher handlebars.
Rubber footpegs.
Handguards.
Eternal Rise Dual-Sport tires (stock Kenda ones are junk).
Cargo Rack (some have it some don't).
Learn the correct way to tighten and check the spokes.
Adjust the valves around 1500 kilometers and every 10,000 k after.

Along with some decent tools, I would carry the following spare parts.
Clutch plates: just the cork fiber ones, the metal ones should be fine.
Spare front and rear tubes and small pump
Oil Filter
Spark Plug
Couple extra spokes
Clutch/Brake lever
Liquid Gasket / Metal Epoxy / Zip Ties

Check your chain adjustment and lubrication every day and change your oil every 3-5 thousand kilometers.

If I was headed out of China, I would probably send tires and tune up parts somewhere out west and do a major tune up before leaving. The prices for motorcycle work are only going to get more expensive as you head further west.

One other thing, learn how to change a flat tire before you go, flats don't usually happen in convenient places .

Cheers!
ChinaV