AMERICAN CHOPPER-Chassis & Engine
https://drive.google.com/open?id=1HBcWqFnF627x-Mq5cxHrp1wjoMiN6Vkh
Chassis

A motorcycles chassis or frame forms its skeleton. all the components of a motorcycle like suspension, wheels, fuel tank, seats, handlebars etc are attached to this base structure which lend a motorcycle its strength and ability to handle well.
Engine

I Model this Engine Using Features like Projected Curve, Composite Curve, Extruded cut, Sweep, Curve driven pattern, Linear pattern, Boss extrude. The Projected curve and composite curve is used to design Exhaust pipe of engine.