Bought a 20" hero kit with a 66cc. Sky hawk. This engine seems to be to big to fit in frame. Pirate cycle has a hero with a pk 80. Looks smaller and the head looks more slanted, hard to tell by the photos I've seen, or am I doing something wrong. Seller has been trying to put me off about my complaint. Don't want to name them yet to give them time to correct the problem. But should a new engine and gas tank smell like gas and should the fasteners look used with tool marks???? What to do?