This is a brand new 420 cc single cylinder engine which has had part of the engine block and cylinder head machined away to reveal the internals. Crankshaft, cylinder, camshaft, balance shaft, pushrods, and valves all work with the turn of the crank. Flywheel, ring gear, starter motor, and carburetor are all still in place as well. The acrylic faceplate is laser cut from acrylic and zinc-plated handle ensures long demonstration life. This is a great way to see how a modern four stroke engine works! These engines are precision machined to order, so please allow 4 weeks for delivery.