Harley-Davidson Sportster мотоциклінің тарихы мен эволюциясы

The Harley Davidson Sportster is a line of motorcycles produced continuously since 1957 by Harley Davidson. Sportster models are designated in Harley Davidson's product code by beginning with "XL". In 1952, the predecessors to the Sportster, the Model K Sport and Sport Solo motorcycles, were introduced. These models K, KK, KH, and KHK of 1952 to 1956 had a sidevalve ('flat head') engine, whereas the later XL Sportster models use an overhead valve engine. The first Sportster in 1957 had many of the same features of the KH including the frame, fenders, large gas tank and front suspension. The original Sportster line was discontinued in Europe in 2020 because the engine failed to meet the stricter Euro 5 emissions standards. An all new model, called the Sportster S and equipped with the Revolution Max engine, was introduced in 2021. It was the first motorcycle under the Sportster nameplate to receive a new engine since 1986, and the first Sportster to have an engine not derived from the Model K.

Sportster motorcycles are powered by a four stroke, 45° V twin engine in which both connecting rods, of the "fork and blade" or "knife & fork" design, share a common crank pin. The original Sportster engine was the Ironhead engine, which was replaced with the Evolution engine in 1986. Sportster engines, the 45 cubic inch R, D, G & W Models 1929 side valve motors, and the 'Big Twin' side valve motors, which were: the flathead Models V, VL etc. (1930–1936), Models U and UL (1937–1948), and the models VH and VLH (1935–1936), models UH and ULH (1937–1941), have four separate cams, sporting one lobe per cam. The cam followers used in Sportster engines, K models, big twin side valve models, and the side valve W model series, were a slightly shorter version of the followers used in the larger motors, but featured the same diameter body and diameter roller follower used since 1929. The company used similar cam followers for decades, with minor changes, from 1929 to the 1980s. Sportster engines retained the K/KH design crankcase design, in which the transmission is contained in the same casting as the engine, and driven by the engine with a triple row #35 chain primary drive and a multi plate cable operated clutch. Models since 1991 have five speeds; 1990 and earlier models had four speeds. The engine was mounted directly to the frame from 1957 through the 2003 model year. While this system allows the bike to be somewhat lighter with more precise handling, it also transmits engine vibration directly to the rider. In 2003, Harley Davidson produced a limited number of 100th anniversary model Sportsters. They are identified by the 100th anniversary paint schemes and plaques attached to the sheetmetal, speedometer housing, and engine. Sportsters released in 2004 and later use rubber isolation mounts and tie links to limit engine movement to a single plane, which greatly reduces vibration felt by the rider. Buell motorcycles built with variants of the Sportster engine have used a rubber mount system since 1987. The Model K, from which the Sportster evolved, was the first civilian motorcycle produced by Harley Davidson with hydraulic shock absorbers on both wheels. Common usage calls this a K Model.

Introduced in 2007, the XL1200N Nightster included (then) unique elements such as a bobbed rear fender, front fork gaiters, and a side mount license plate. The riding position and seat height of the Nightster are the same as those of the XL883L Sportster Low UK version (along with Iron 883 and Forty Eight) has central number plate, 13.5 inch rear shocks, tapered silencers, and combined LED indicator/tail/brake lights. The bike has a measured HP of (rear wheel) and (rear wheel) and a top speed of and a wet weight of
The Nightster name returned in 2022 with a 975cc engine.

In the 2008 model year, Harley Davidson released the XR1200 Sportster in Europe, Africa, and the Middle East. The XR1200 had an Evolution engine tuned to produce , four piston dual front disc brakes, and an aluminum swing arm. Motorcyclist had the XR1200 on the cover of its July 2008 issue, and was generally positive about it in their "First Ride" story, in which Harley Davidson was repeatedly asked to sell it in the United States. One possible reason for the delayed availability in the United States was the fact that Harley Davidson had to obtain the "XR1200" naming rights from Storz Performance, a Harley customizing shop in Ventura, California. The XR1200 was released in the United States in 2009, in a special color scheme including Mirage Orange highlighting its dirt tracker heritage. The first 750 XR1200 models in 2009 were pre ordered and came with a number 1 tag for the front of the bike, autographed by Kenny Coolbeth and Scott Parker and a thank you/welcome letter from Harley Davidson, signed by Bill Davidson. The XR1200 was discontinued on the United States Market after 2012. For 2012, the XR1200X model had upgraded suspension front and rear. The bike has a measured HP of (rear wheel) and (rear wheel) and a top speed of and a wet weight of The bike has a measured HP of (rear wheel) and (rear wheel) and a top speed of with a wet weight of .

In the 2016 model year, Harley Davidson introduced the XL1200CX "Roadster" model. This is the sporty Sportster with café bike styling and stance. With mid position pegs and a slammed drag bar give a slight lean forward riding position. A 43mm inverted cartridge fork and in the back preload adjustable emulsion type shocks help the roadster to have the greatest lean angle of any Sportster. Also standard are twin 300mm floating disc brakes and a tachometer. The bike has a measured HP of (rear wheel) and (rear wheel).

In 2021, Harley Davidson launched the Sportster S with the new Revolution Max 1250T engine and described it as a "sports custom motorcycle". In an independent review, UK publisher Bennetts commented that: "Despite the Sportster moniker, the new bike’s specs mean it’s got more in common with the old V Rod than its namesakes. 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 result means the Sportster will be a significantly better performing machine, both in a straight line and around corners, than the old V Rod."

Buell started with water cooled two stroke square fours and ended with a water cooled four stroke V Twin, but the vast majority of their bikes used reworked 883 and 1200 Sportster engines. With Buell designed heads, barrels, and in 1999 fuel injection, these all led to an increase in horsepower. They also had rubber mounting and a fan to cool the rear cylinder.