Some quick notes from this trip
Check the rental bike thoroughly. Start it look for dripping fluids, check chain and sprockets, remove the from sprocket cover if necessary to check it.
Get some basic spares for the bike - levers, tire changing tools, innertubes etc....
Get a Chinese phone SIM card, with internet if you have a smart phone, was very useful having internet.
Take a GPS map of China, it means you're not scared to go exploring which really made our trip.
October to May is the riding season in the Yunan/ Kunming region... July -Oct, the NE Monsoon rains come there. You can ride later in the (Aug-Sep) in the NW towards Shangri-La and the Tibet border.
Don't go on the toll highways.
Take a tow rope can save huge hassle with a bike you dont know.
American plug socket type are in all hotels for charging appliances.
Take chap-stick or Vaseline for your lips, we both got chapped lips in the mountains.
Activate international dialing on your Chinese SIM card, not automatic.
My smart phone as a WIFI hotspot did not work in China, maybe a way they control you there not being able to get on social media (FB/ Twitter etc..).
Kunming is at 1,800 meters, the weather is mild and windy, bring a warm jacket. Temperature there only varies by about 10 deg C all year in the 20's deg C normally.