1922 Henderson K de Luxe
In 1922 the 28 hp (at 3400 rpm) DeLuxe was released. Improvements included a larger, more efficient carburetor, improved intake manifold and rear brakes; redesigned crankshaft, cylinder head cooling, exhaust system and seat. There were also optional Lynite die-cast alloy pistons and a revised reverse gear.
The heavier Police Department version was demonstrated first to the Chicago Police, and achieved 98 mph. When it was demonstrated to the San Diego Police a genuine 100 mph was achieved. Harley Davidson, decided to challenge Henderson to a contest that was held at Dundee Road, Chicago, in April 1922.
The Harley won the first heat, but lost the other eleven, with the Henderson exceeding 100 mph. This was a shining hour for Henderson. Between May 30 and 31, 1922, Wells Bennet and his Henderson Deluxe set a new 24‑hour endurance record (including all the intermediate records) at the Tacoma Speedway, Washington, clocking up 1562.54 miles averaging 65.1 mph. This record was not beaten until 1933, by a Peugeot with a team of four. The solo record was not bettered until 1937 when Fred Ham's 61 cubic inch Harley averaged 76 mph.
On December 11, 1922, William Henderson was killed in a motor accident testing his new Ace. In 1923 Arthur O. Lemon left Excelsior to become chief engineer for Ace.