A camshaft on an motorcycles internal combustion heat engine is a device that controls both the input of fuel and the expulsion of exhaust fumes. It consists of several radial cams, each displacing intake or exhaust valves. This camshaft is connected to the crankshaft via chain and gears.It also includes many parts,valve stem seal,valve rocker arm comp,rocker arm shaft,intake valve,exhaust valve,spring of valve outer,spring of valve inner,valve spring retainer. In order to improve efficiency,it needs to have a responsive cam system is of utmost importance.As a result of that, there are various types of cam profiles to enable the "Variable Valve Timing and Lift" to offer flexibility.Various kinds of cam profiles include Radial Cam, Cylindrical Cam, Wedge Cam, Conjugate Cam, Globoidal Cam and Spherical Cam.