I made this Schwinn cruiser to look like a motorized bike but it's actually just for looks,the engine is a dummy made out of plastic that i got off of a scrap kids bicycle that was designed after a Harley Davidson,the exhaust is a plastic stick on auto accessory item,the tank is metal but again just for looks.I really liked the look of this scaled down V Twin engine so i installed it on my cruiser along with a few other accessories to give it a motorcycle look and it sure turns heads but can you imagine a two cylinder bicycle...this thing would really fly!