This is one ya don't see every day! I think that these were made by P.M.C. Some had no interior and some did. The ones with no interior usually warped beyond hope. The ones with the interior (as is this one) were made of a different plastic that didn't warp! They both had a metal chassis (promo style) with a flywheel. I have changed the chassis to an AMT 57 ford. It has Revell 59 retrac chrome. The go cart is from an old 1963 Ford f-100 kit. (with a parts box 650 triumph engine) The Harley is from The Revell Ford/Harley Davidson kit.