The serial numbers run J200,000 up to J252 +++, about 52, 000 engines more or less a few. The tank is embossed WHIZZER on both sides, and the controls are motorcycle type twist grips. The external appearance is similar to the 'H', except that the carburetor in most cases is a Carter 'N'. The 'J' engine was introduced in May of 1948. The engine develops a whopping 2.5 horsepower. The clutch lever is on the left handlebar. (139,000 engines) The gas tank is plain silver/gray with a yellow decal on each side, and the compression release and throttle control are two thumb controls mounted on the right handlebar. The serial numbers run from H 501 thru H 140 000. It has a low fin head with the spark plug leaning towards the left side. After the war, Whizzer offered a substantial trade in for the earlier engines on the new 'H' engine. The gas tank more closely resembled the later tanks, except with a screw- on cap. The engine turned counterclockwise, and a belt drive to a rear sheave was used. The 'F' Model came out during the War, around 1942.There were about 4250 of these, but probably not all were sold. The 'E' Model Whizzer A nice view of the drive arrangement and clutch. As such, it may well be the earliest surviving Whizzer. According to Leon Dixon, curator of the National Bicycle History Archive of America, the serial number of this engine is D003. Pushing the clutch forward makes the bike go. It is connected via a cable to the roller mechanism. There was never an 'A','B','C',or a 'G' or 'I' model, nor a '400' series, or at least they were never marketed.Ī nice 'D' model The lever on the left side of the tank is the clutch. The 'D' and 'E' model engines turned clockwise, and drove the rear wheel through a friction roller mounted under the frame.

The metal has a tendency to rot, and fall to pieces. The pot metal crankcase was made in two pieces, as were most of the motorcycle crankcases of the day, and was rather fragile. There was before that a 'D', 'E', and 'F' engine, but they were not the same configuration as the later engines. The Whizzer motorbike most people are familiar with originated in 1946, with the introduction of the 'H' engine.

Whizzer engine serial numbers