Travis bicycle engine Cylinder and Piston from the 1950s. These are actually Power Product engines and guessing this to be the base of a Power Products 1000 engine. Whats cool about these cylinders is they have compression release built into the head and thought it would be cool to put 2 of these cylinders on a Monark Super Twin so it had compression release. Perfect backup set for your Travis motor bicycle motor. It's in darn good shape. No broken fins that I can see and has the compression release built into the Power Products head. Piston and Rod come with it. Good stuff... lol