Henderson Motorcycle Co was an American manufacturer of in-line 4-cylinder motorcycles from 1912 until 1931.
In 1930, the Henderson “Special” KL was demonstrated on a new, smooth concrete Illinois highway. Joe Petrali achieved 116.12 mph and 109.09 mph on two recorded runs, averaging 112.61 mph. It had higher compression compared to the standard K, two-ring pistons and an enlarged 1.25 inch (32 mm) carburetor. The engine produced 45 hp at 4,500 rpm and was remarkably flexible in top gear, pulling smoothly from 8 to 110 mph.
