An internal combustion (IC) engine (101) for a two wheeled vehicle comprises of a cylinder block (204) and a cylinder head (203). The cylinder head comprises of an EGR intake passage (310) extending from an intake port (230) and an EGR exhaust passage (320) extending from the exhaust port (240), the EGR exhaust passage (320) intersecting the EGR intake passage to permit the flow of exhaust gases from at least one of said exhaust port to at least one of said intake port through an EGR control mechanism (201). The EGR control mechanism is easy to implement in any two wheeled or three wheeled vehicles in spite of space and layout constraints. This mechanism also decreases the number of components and thereby is cost effective. Furthermore, effective control during various throttle positions can be achieved to significantly reduce NOx at all stages of vehicle operation.