In September 1949, in order to keep pace with its new competition, Whizzer released the Model “300” Motor. This new engine had 7/8 in. valves, a more efficient combustion chamber, better cooling, and a higher compression ratio. These changes resulted in a 3 HP engine that could reach speeds of 40 mph. Whizzer sold about 15,000 Model “300” motors at $109.97 each.

Whizzer also released the “Sportsman” motorbike which was more like a real motorcycle. The “Sportsman” abandoned pedals altogether and used a kick-starter to get the bike going. The “Sportsman” cost $224.50 for the Standard edition, which had a clutch transmission, and $239.50 for the Deluxe edition, which sported the Bi-Matic automatic transmission.

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The Whizzer bicycle engine was first produced in 1939 by Breene-Taylor Engineering, a Los Angeles-based manufacturer of airplane parts. By 1942, sales of the engines had not been entirely successful, having sold only about 2500 units. The Whizzer operation was then sold, and by 1943 World War II was well underway – Whizzer Motors was forced to lobby the United States Government for the right to continue production of what was argued to be a great way for defense workers to travel to and from work.

In 1948, Whizzer sold its first pre-assembled motorized bicycle, the “Pacemaker”. Whizzer motorcycle engines would cease to be produced in 1965 due to the increasingly competitive bicycle engine market.

Then in 1997, Whizzer motorcycles were brought back into production in the same style as the originals but with technological improvements.