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The Harley-Davidson Milwaukee-Eight engine is the ninth generation of "big twin" engines developed by the company, but only Harley's fourth all-new Big Twin in 80 years, first introduced in 2016. These engines differ from the traditional Harley Big Twin engines in that there are four valves per cylinder, totaling eight valves, hence the name.
By the end of its life, the V-Rod had a 1247cc, water-cooled, DOHC V-twin making 125hp, putting it within spitting distance of the new Sportster’s 1252cc and 121hp. But the old bike was a much heftier machine, coming in at around 300kg depending on which version you picked, where the Sportster S is a relatively lithe 228kg ready-to-ride.
The first year of Sportster, a development of the KH with overhead-valve engines and cast iron heads. The engine was updated after 29 years. [3] XR-750: 46 cu in (750 cc) 1970–1985 Overhead-valve engines, iron heads (1970–1971), alloy heads (1972–1985) XLCR: 61 cu in (1,000 cc) 1977–1978
In 2021, Harley-Davidson launched the Sportster S model, with a 121 hp engine and 228 Kg ready-to-ride weight. [152] The Sportster S was one of the first Harleys to come with cornering-ABS and lean-sensitive traction control. [153] The Sportster S is also the first model under the Sportster nameplate since 1957 to receive a completely new engine.
They can also be added on as aftermarket accessories and are powered by the bike's electrical system. Some touring motorcycles, such as the Honda Gold Wing, have louvred vents in the fairing which redirect warm air from around the engine or exhaust toward the rider. [1] These motorcycles may also feature vents for cooling the rider. [2]
semi-automatic transmissions are also in use; where the driver's input is still required for shifting gears, but the clutch system is controlled and operated automatically. These systems are mostly found on smaller dirt bikes (e.g., minibikes ; such as pit bikes ), underbones , many older mopeds and scooters, and various other types of motorcycles.