Harley-Davidson - opens in new window or tab. and Indian produced some of their best machines in the early 20th century. The Henderson KJ Streamline was at least equal to both—and just about everything else on two wheels. The “showroom condition” KJ recently sold on eBay in Redondo Beach, Calif., is one of the finest examples available.
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Ahead of Its Time
This KJ is resplendent in deep red with a tan saddle and off-white rims. The listing photos appeared to back up its reported complete restoration.
A period-correct tire sits underneath the pinstriped front fender, which is a fine example of form equaling function. The fender is Art Deco style, if a little restrained. Two holes on either side are beautifully cut into it at a challenging angle, required to run the leading-link front forks.
Behind the forks is a gorgeous teardrop fuel tank, also tastefully pinstriped. On top is an illuminated speedometer. Features like this and the forks were way ahead of their time.
Triumph of Engineering
The engine was likewise a triumph of engineering. Each cylinder has its own carburetor. The engine produced 40 horsepower at 4,000 rpm, numbers that were almost unheard of for a road-going machine of the time. It also looked good. Fittingly, it dominates the frame with its four inline cylinders.
A springer-style seat - opens in new window or tab. and rigid rear end are aft of the motor. The rear fender shares the front’s restrained Deco look—flair, but without excess.
Built For Speed and Smoothness
Henderson was established in 1912. The company built exceptional motorcycles for every one of its 19 years of existence. As the late 1920s came into view, Henderson knew it was time for a new hit machine to keep pace.
Arthur Constantine, famed H-D designer (and AMA Hall of Famer - opens in new window or tab.), approached Henderson after he was controversially dropped by the Milwaukee concern for producing a V-twin motor the top brass deemed “a waste of valuable company time.” Almost immediately, his work at Henderson/Excelsior saw tremendous success on the tracks and in showrooms.
The KJ Streamline was Constantine’s masterpiece. It offered legendary smoothness and speed. Constantine revised the existing inline four-cylinder motor with five main bearings supporting the crank (instead of the three previously used), an improved pressurized lubrication system, and a downdraft inlet manifold. Apparently, 100 mph was not a struggle for a KJ, which is mind-bending speed for 1929.
Legacy
Sales were encouraging, and things looked promising. But in 1931, with the Great Depression taking hold, boss Ignaz Schwinn announced to the Excelsior/Henderson department heads with no warning: “Gentlemen, today we stop.” And that was that.
Such a short production run of such an esteemed motorcycle with such a rich legacy makes a Henderson Streamline KJ one of the crown jewels of American motorcycling. Buy one, and all you’ll need are some vintage leathers - opens in new window or tab. to complete the look.
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This article is meant to provide general guidance only. Automotive maintenance, repair, upgrade, and installation may depend on vehicle-specifics such as make and model. Always consult your owner's manual, repair guide for specific information for your particular vehicle and consider a licensed auto-care professional's help as well, particularly for advance repairs.