Royal Enfield has updated its entire range of its products with Automatic Headlamp On (AHO) and BS-IV compliant engines. The Chennai-based manufacturer has also increased the price of its bikes by up to Rs 4000. The dealers have already started accepting bookings for these bikes. In fact, a few dealers down south have already received the updated Classic 350 and the Thunderbird 350. Unlike other manufacturers, Royal Enfield dealers are not offering any discounts on the bikes they have in their stockyard. They are confident of clearing the existing stocks before March ends.