Royal Enfield Himalayan modified with NMW Racing big bore kit. Episode 1 of the Project HT500 shows the details of what is to come in this interesting Himalayan modification build. br br The Royal Enfield Himalayan receives a 500cc Big Bore Kit, Bigger Valves, Ported Engine Head, High-Lift Camshaft and a 4-Map Racing ECU. Stay tuned for more details about the 500cc Himalayan.