Well I received my SK 50 yesterday and today it was bolted to the test stand and ran twice. I followed their break-in procedure and during the first run the carburetor was sticking when I tried to close or open it and after the second run the carb. barrel would not turn at all. Need to call Kangke tomorrow.

Hay bubbup, did you receive your engine? If so, how is it running?

Will keep you posted.