Featured in the the Guggenheim Museum's Art of the Motorcycle exhibit

Built by William Henderson of the Ace Motor Corporation of Philadelphia, Pennsylvania

1923 Ace XP-3 Experimental Motorcycle Replica

Founded by William G. Henderson in 1920, the Ace Motor Corporation began manufacturing
high-performance inline four-cylinder motorcycles that were styled after Henderson's
compelling Excelsior-Henderson Model F and Model G inline-fours.
Henderson's goal was to build the fastest motorcycle in the world, and the first bikes produced by Ace
were a series of five experimental four-cylinder engines known as XP1 through XP5.

By early 1923, Charles 'Red' Wolverton defected from Excelsior-Henderson to become Ace Motor Corp's chief test-rider.
To aid in the tuning of their magnesium-cased engines, Ace was one of the first motorcycle manufacturers to use a brake
dynamometer to extract every ounce of horsepower. According to Wolverton, their first engine blew up on the dynamometer, sending the magneto past his ear. The management at Ace was so confident in their new engines that they put up $50,000 to any other motorcycle manufacturer who could beat their bikes.

In November 1923, Ace set two world speed records with their EXP-4 which reached 129.61mph, and their EXP-3 sidecar version which reached 106.8mph. The EXP-3 used a detuned version of the EXP-4 engine, with aluminum crankcases and a pressure-feed lubrication system.

Arthur Lemon became the company president in 1923 after the passing of William Henderson. Despite the legendary achievements of the company, financial troubles led to the sale of the company to Indian in 1927.