What I ordered from BikeBerry: "Flying Horse" 66cc Slant Head Engine Kit, universal U-mounts. Ordered replacement hardware at SBP, extra petcock (intend to make my own tank - the stock one is a little cheesy.) What I got: A Grubee Skyhawk 66cc kit, not sure if slanted or not. Is this normal to get a different engine, and if it isn't, should I be worried? I don't want to send it back - it took long enough to get here. What are the significant differences between the Skyhawk and the Flying Horse? Telltale signs whether it's a slant or not?