I had the same problem- to fix it I put washers between the wheel and the bike frame. Say you needed 3 mm of space for the chain to clear, you'd need to add 6mm of washers for the chain to clear.
Last night, I lay in bed, looking up at the stars, and I thought to myself, "Where in the world is the ceiling?"
66/80cc Stinger on a Black Huffy.
6-speed shifter kit pulling a trailer.
Everything stock(so far)