Bullet’s Lean Burn Engine

Lean burn engine, you must have heard this when TVS launched its apache but before apache Royal Enfield incorporated this technology in Thunderbird. In the Lean Burn engine included valve angle has been reduced from 80 to 55 degrees for better flow, and the combustion chamber has been made more compact to promote faster, cleaner burning. Repositioning the valves allows the spark plug to be more centrally located to shorten the flame path. The pushrod-actuated valve train has been lightened and strengthened, and the bike also gets other improvements in bearings and lubrication in the interest of longer engine life. The compression release activates automatically with the electric starter, or you can use the manual release with the kickstarter. Finally, the Pulse Air System helps it meet most emissions requirements. Royal Enfield offers 346cc bikes Bullet 350, Bullet Electra, Bullet Electra 5S, Bullet Machismo and Thunderbird in India. The company’s R&D Team is working with design experts to put a new bike which would have better fuel efficiency and would be offered at a more affordable price point from the Royal Enfield stable on the roads in 2007. The new bike is expected to be lighter by 15 kg (the present mean machines weigh approximately 175 kg!). The new offering will be in the 350 cc and above