Harley-Davidson Sportster 50th Anniversary Hot Bike

6 Июн 2015 | Author: | Комментарии к записи Harley-Davidson Sportster 50th Anniversary Hot Bike отключены

Harley-Davidson Café Racer


Harley began motorcycles in 1903 and introduced the in 1957. Since then, the has been in production without a for the last 50 years, making it the holder for a continually produced in America. It even beats out the Chevy Corvette for top honors, the Vette missed a year of in the early ’80s.

Within a of its debut, the Sportster became as the first of the Superbikes and one of the company’s enduring models.

Looking 50 years, the launch of the first Sputnik was on the horizon, ’57 were in, and Elvis and rock roll music were But the origins of the Sportster go back way that, all the way to the 1929 model, a inch middleweight that later become known as the During the ’30s and early the Factory had enormous success various models of the 45-cubic flathead.

In 1946, Harley-Davidson the 45-cubic inch Flathead WR motorcycle, which proved to be one of the racing motorcycles ever In 1952, the W models were with the revered 45-cubic side-valve K series. The new K-models an integrated four-cam engine and transmission design, along foot shift, swingarm suspension, and telescopic front to compete with smaller, motorcycles coming mainly Great Britain.

Over the several years, Harley-Davidson upon the 45-inch K-model, stroking the Flathead engine and displacement to 53.9 cubic (883cc). Harley sold the new model as the 55-cubic inch KH (H for believing that 55 cubic carried greater marketing than either 53.9 inches or 883cc. However, the powered K was still being by cheaper, high-revving 40-inch imports, so the Factory knew it a more powerful middleweight

In the mid-’50s, Detroit auto were transitioning from to overhead valve (OHV) so Harley engineers decided to suit and designed the new model overhead valves while engineering of the W-model and retaining the integrated engine/trans and four-cam As such, the Sportster XL was born cast-iron OHV cylinder heads and rocker boxes that led to the Shovelhead engine design in Rumor has it that the genesis for the XL was spawn from the name Lightweight.

The objective for using an valve design on the Sporty was to cylinder filling and power. OHVs, the valves are located in the head and positioned above the A valve opens by moving toward the cylinder, providing the mixture a rather direct and path into the cylinder for filling.

On the other hand, a Flathead (also called engine, the valves are not in the cylinder instead, they are located or directly to one side and parallel to the and move upward during This arrangement requires the mixture to make two 90-degree to either fill or exit the which is much less than with an OHV engine.

the new OHV Sportster engine and older KH engine were both at 883cc or 53.9 cubic Factory engineers destroked the from the KH’s 4-9/16 … to 3-13/16 inch. To the same displacement with a … necessitated increasing the bore to 3.00-inch from the previous 2.75-inch. The Sporty’s … and larger bore the use of bigger valves while a higher revving engine lower piston speed at any rpm.

The Sportster’s new cast-iron heads designed with deep combustion chambers, similar to aircraft engines. The hemi-style allowed for big, high-flowing but also required heavy pistons for high compression. pistons make balancing an more difficult, while piston domes impede airflow during valve and interfere with flame during combustion.

Note in the ’80s, both the Evolution and Big Twin engines were with lightweight flattop and shallower combustion chambers to the inherent drawbacks in the original Sporty. The ’57 Sportster XL was with a rather conservative static compression ratio an OHV engine). Two years later, the was upped to a more reasonable 9:1

The XL’s aluminum pistons to Harley’s typical knife-and-fork connecting rods riding on a crank with heavy The four camshafts were a from the K-model and provided pushrod angles (and accurate valve timing) with a single-cam design. roller tappets rode on the cam and transmitted valve timing to the arms via steel-tipped aluminum

The ’57 Sporty cylinder shipped with relatively valves, but valve sizes increased in ’58.

The integrated design made for a very yet rigid drivetrain that was years ahead of the British A robust triplex primary connected the crank to a dry clutch, was a carryover from the K-model, as was the transmission, right-side secondary and right-side foot shift. A cradle-style frame rolled on 18-inch spoked wheels, narrow drum brakes as binders for stopping.

A Linkert DC carb with a float bowl (not the M-53 Linkert on the K) was fed gas from a fuel tank. Instruments sparse on ’57 XLs, only a nacelle-mounted speedometer. a hand-actuated fork dampener for wheel wobbles was standard on the front fork.

The Sportster XL was a hot rod with a solo seat to take on the British imports. To end, options were and primarily limited to a sport rear luggage rack, seat, fiberglass saddlebags, and package.

In 1958, XL models with low compression motors, but the new (CH for Competition Hot) came larger valves and high-dome 9:1 pistons. Simply put, the was a stripped-down, lightweight Sportster straight pipes, scanty no lights, magneto ignition, and a gallon peanut fuel

The Fairbanks-Morse magneto often kick-starting the Sporty an adventure than a routine procedure, because a magneto throws a spark at low engine rpms and because the mag had no provision for setting an advance curve. Early models required the magneto be set to advance 100 percent of the time, 45 degrees BTDC, which caused the engine to kickback a hefty and precisely timed was placed on the kick starter.

A or hesitated effort, especially a hopped-up motor and lightweight often resulted in the kicker tossed onto the handlebars, or worse, a sprained ankle. XLH owners had a large 6v battery and system for firing the ignition.

The theme of the ’58 models was the street-oriented XLH came adorned more sheetmetal and accouterments the off-road and hot rod-based XLCH. To mud and road debris off the rider, XLH had larger, deeper, and more fenders than the skimpy versions embellishing the XLCH. All XLHs shipped with wheels and 3.50-section of rubber on front and back, while the was shod with 3.25×19 on the front and 4.00×18 on the backside.

The headlight on the XLH was chrome and rather patterned somewhat after the FL-series bikes. In contrast, the headlamp was bare bones and painted. A robust cast-aluminum cover enclosed the triplex chain and clutch basket on XLH while CHs shipped with a stamped-steel cover.

And any CH owner to fend off Triumph Bonnevilles for the racy dual-exhaust option.

For XLHs came fitted a nacelle-style headlight and dual And as the years progressed, Sportster evolved with more and improvements. After 1959, the major milestone year was 1965, when the XLH and XLCH delivered with a 12-volt and electrical system.

Harley-Davidson Café Racer

That the XLHs used two 6-volt wired in series and didn’t get a battery until the next 1966 also saw the Tillotson carburetor and so-called oval air cleaner replace the Linkert DC and its round air cleaner assembly. developed earlier, P cams became available. In 1967, start became an option.

A of kick- and electric-start options in effect until 1980, all models shipped only electric start.

The Sportster was with new cylinder head and port shapes in 1969. was also the last year for a ignition on the XLCH. 1971 saw the of the single-spring wet clutch, and in 1972, the (55 cubic-inch) engine was replaced the 1000cc or 61 cubic-inch engine by bore size 3/16-inch to inches.

The new engine had 9:1 compression and was rated at 61 which allowed the CH to rip off low 13-second mile times at around 98

About that same a few years earlier, in 1970-the AMA the rules for Class C racing to for 750cc overhead-valve engines. led the Factory into developing the new XR-750. The OHV XR-750 would the venerable side-valve KR 750 racer. The is a de-stroked Sportster engine twin carbs and all-new components. The 1970-71 models with iron heads and but was only a stopgap measure.

In a new, more powerful, reliable aluminum alloy debuted and became the dominant track racer through the three decades.

The early to mid saw an influx of fast European and imports that were or even surpassing the Sportster’s That fact and the sale of to AMF seemed to change the Sportster’s position from one of a mean hot rod to only a middleweight bike a product line niche.

At that was until the introduction of the Sportster in 1986. The new aluminum-based Evo engine opened the doors to and aftermarket performance parts again made the Evo Sporty a street-fighter and racer, especially engine displacement was bumped the 100-plus cubic-inch range.

For interested in getting a burst of from the latest Sporty designed for the new millennium, checkout the XL Nightster. With a wicked of styling, stance, performance, and attitude, the Nightster has a gritty, feel offering an exhilarating

And while you’re at it, don’t the new 50th Anniversary Sportsters honor the family heritage a special 1200cc model. new Electronic Sequential Port Injection (ESPFI) system, new and 50th tank emblem, the Anniversary Sportster pays to a legend in the tradition of previous Harley-Davidson models. See for yourself why are few motorcycles as enduringly popular as the Sportster.

Sportster Milestones

Sportster XL 883cc, 7.5:1 CR 1957-65 Linkert DC Carb Kick-start 1957-71 Early-style oil pump 1957-77 Original frame 1958 9:1 CR, larger 1965 12v Generator 1966-71 Carb 1967-79 Electric option and/or kick 1969 Last Magneto 1969 New Cylinder Head 1970 Distributor-only Ignition 78 Points Mechanical advance

1971 1st Cone-style Ignition cover 1971 Wet Clutch spring 1972 1000cc replaces 883cc engine Bendix Carb 1972-76 barrel oil pump 1973 1st AMF Harley models 1973 Kayaba forks single-disk brake 1975 35mm forks 1976-87 Keihin carb (not CV) 1977 oil pump 1978 late-79 Mechanical Ignition 1979 year for XLCH 1979-81 2nd Frame 1980 Electric Only

Harley-Davidson Café Racer
Harley-Davidson Café Racer
Harley-Davidson Café Racer
Harley-Davidson Café Racer

Interesting articles

Other articles of the category "Harley-Davidson":

Our partners
Follow us
Contact us
Our contacts


Born in the USSR


About this site

For all questions about advertising, please contact listed on the site.

Motorcycles catalog with specifications, pictures, ratings, reviews and discusssions about Motorcycles.