I saw $50 engine kits from Hong Kong on eBay yesterday with free shipping. I ordered one kit and just received notice it has shipped. The advertised bore and stroke is 47mm x 40mm so it's a 69cc engine. I've ordered more expensive engine kits from China and they have always been delivered to my door. Does anyone have experience with such low priced kits? If it's not a scam would I have to pay anything to get it through customs?