Lots of HT motors here:
I've been in contact with one of the factories that makes the China girls. The sales reps are happy to talk to you and answer some questions but have very limited knowledge of technical issues with the engines. The technical contacts don't answer emails either, so it is hard to get information about them. This is from the "Woodpecker Gasoline Engine Factory" in China. There is another company "Flying Horse Gasoline Engine Factory" to which the contact says is another completely different manufacturer offering the same product.