Royal Enfield's old-time looks have attracted more buyers.

Royal Enfield plans to increase production of its motorcycles due to increasing demand.

The company introduced fuel-injection and unit-construction 500 cc engines to its models this year, a move that has proved popular with buyers.

Royal Enfield is based in India and uses tooling and blueprints from the former British motorcycle company, making bikes with some of the most primitive technology in motorcycling. But their qualities of retrograde looks and old-fashioned goodness have charmed buyers, and now some modernization has crept into the line, promising improved dependability. The marketplace has reacted by demanding more bikes.

Royal Enfield plans to increase production from 52,000 units to 70,000 in 2011, then 90,000 in 2012 and 100,000 for 2013.

Money is also being spent on a new paint studio and other upgrades. Royal Enfield motorcycles are distributed in Canada by Bullet Motorcycles , of Edmonton.