This is a reproduction 138cc 4 stroke (bore x stroke = 57mm x 54mm) whizzer engine kit.Cruzzer Motorbike Engine Kit-NewManufactured by "The Whizzer Industries Co. Ltd." inTaiwan, the same people who make the whizzer parts. Installation and operation instruction in cruzzermotorbikes dot com.Kit contains the Following Motor Complete, with Keihin Carb and Flywheel Manual Clutch Kit Exhaust pipe and manifold SwitchControls (L & R) and grips Wire Harness withrectifier and CDI Control cables 2Belts Belt cover Fuel Tank (black) Compression release breathercanAir Filter housing Rear wheel belt drive sheaveAll hardware needed for above We are offering complete parts and kits for a home-built Cruzzer Motorbikes. The assembling processes are shown by videos on our website "cruzzermotorbikes.com". For more detailed information, please check our blog "wc1manufacturer.wordpress.com" by Google search.NOTICE: We, the seller of listed item or items, are NOT Whizzer USA. We DO NOT represent Whizzer USA. We are NOT affiliated with Whizzer USA or the Trademark Whizzer, Whizzer USA, Whizzer motorbike. We manufacture and sell aftermarket parts that will fit on certain Whizzer motorbikes and non-Whizzer scooters. We do not manufacture, offer or sell Whizzer brand parts. Any use of the term Whizzer or Whizzer models in the listing are solely for item description purpose only.