Clay, the engine with the oil pulgging problem was a YS 1.20 four stroke. Nothing new about a YS 1.20. I think Don is onto something about the oils not mixing well with each other. Oil getting to a solid gummy state in a few weeks isn't normal. I only brought it up because there have been a lot of posts asking about adding oil to the fuel. I usually don't.
I was able to get hold of someone at Kangke. They gave me the number of the service center. Seems there is no one home there either!! I did pull the back plate off the SK and took a look. The big end pin on the crank had broken off, looks like it was sheared pretty clean and flush with the crank.