By the time the Model KJ was released in March of 1929, the Henderson brothers, Bill and Tom, had been gone from the company they had started by almost a decade. The Henderson Company was bought by Ignatz Schwinn in 1918 to supplement his own Excelsior Motorcycle Company, which had been producing single and two-cylinder V-twin motorcycles since 1907. The Henderson brothers stayed with the company until 1920, when they left to form the Ace Motorcycle Company.
The Model KJ Streamline was designed by chief engineer Arthur Constantine, who had been hired by Schwinn away from Harley-Davidson in 1928. When it was released, it boasted of 57 new features added, although the basic engine design was still the proven inline four-cylinder that the Henderson Company had been using on its previous models since 1912.
The line of the upper frame tube was nearly straight, from the top of the fork to the rear axle, adopting a triangular tank for fuel, that staying on top a group of very complete control instruments, consisting of a speedometer, an indicator of oil pressure, ammeter and a switch to electric lights.
The front fork was not the type for lower links to wheel spin, but wheel driven, and mounted a front brake drum and shoes floating.But the real work of art was its engine, completely new: although the displacement of 1,300 cc had remained motionless, crankshaft bearings going to be five instead of three previous model.
Henderson KJ specifications
Engine and transmission
Engine: 1301cc aircooled in-line 4-cylinder
Max speed: 100mph