![]() Oddly, Harley-Davidson used right-side drives on all their lower displacement machines, from the 45-cubic-inch flatheads in the 30s and 40s, right on through to the Sportster line still produced today.īraking on the Duo-Glide is your standard 1960s drum brake design. Like all big twins, the rear chain drive is located on the left-hand side of the motorcycle. The gas is fed to the motor through a single Linkert butterfly style carburetor and the exhaust exits the motor through dual fishtail mufflers.Ī second chain drive connects the transmission to the rear wheel, allowing the Duo-Glide's 55 bhp to hit the street. ![]() The twin cylinder engine uses Harley's standard 45 degree "V" cylinder arrangement which produces that "potato, potato" exhaust note that Harley is known for. This was only the second overhead valve big twin to come out of Milwaukee, the first being the infamous "knucklehead" which now brings top dollar at auction and private sales. The Duo-Glide is powered by a 1200cc overhead valve engine, nicknamed the "panhead" due to the pan shaped valve covers it uses. ![]() While Harley struggled to compete in these new market segments, it continued to produce "heavyweight" machines that remained popular with the club and touring market.Įven with its hands full trying to stem the tide of imported machines, Harley's engineers continued improving its heavyweight machines with upgrades like rear suspension, 12-volt electronics and foot-shifted transmissions, producing reliable motorcycles ready to eat up the miles of highway that crisscrossed the United States. First came "middleweight" machines from British manufacturers like Triumph and Norton, followed by the Japanese "lightweights" from Honda and Suzuki. Throughout the 50s and 60s, Harley's main competition came from overseas. ![]()
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