I have a flying buddy that always has to go cheap. I finally talked him into a Thunder Tiger and he couldn't be more satisified. He has had several of the cheap engines and we found the SK50 to be a really good engine as long as you use the big props. He has talked to the importers rep several times (a real person answers the phone) and has bought several of their carbs to get his other cheap engines running. Time will tell but he has a couple of gallons thru one and it is a good runner.
Fred