In 1962, The Pacer and Ranger were 165cc, while the Scat was 175cc. See the 1962 detail chapters for more on the mix of 165 and 175cc engines in 1962. It is believed that the 1963-1965 BTU's used the 175cc engine, but this is not certain. In 1962, the Pacer BTU had the 165cc engine, while the standard Pacer BT had the new 175cc version. The BTU's achieved the low horsepower effect by using a special cylinder with a restricted intake port rather than a different carburetor. This is a matter for further investigation. The late 19 STU's are odd - they appear to have used a different cylinder instead of a different carburator. The STU's orifice just had a smaller opening than standard ST's. The Model 165 STU, produced from 1954 to 1959, had a carburetor with a restricted orifice. Produced 3.5 hp, but apparantly many people wanted the increased power and style of the Model 165. The 125cc Hummer was already eligible, since it only The U models had a restricted intake system to drop the horsepower to just below 5, making them eligible for junior licensing restrictions. Those days, Go-Karts and MiniBikes were quite popular, and Harley-Davidson tapped the junior market with special versions of the Model 165, Super-10 and Pacer. These laws were prevalent in the mid-western states. In the 50's and 60's, many states had a "junior driver's license" which allowed 14-year-olds to drive motorcycles under 5 Horsepower. The American-made lightweights followed this scheme, with a few Started rolling off the assembly line in 1937, they might have been: 37 E 1001, then 37 EL 1002, then, and so on. But the Sequence Designator was shared among variants of the basic engine type. The second E model got 1002, and so on until the end of the year.
The first E model off the assembly line in 1937 was given The Sequence Designator was 4 or 5 numeric characters, representing the order in which a completed bike left the assembly line. An ELP was a high compression Police version. Additional letters indicated variants of the engine or bike. An "E" was a 61 cubic inch overhead valveĮngine. The first character letter of the model number indicated the basic engine type. The Model Designator varied from 1-to-5 alphabetic characters. The Year Designator was always 2 numeric characters. The format was (using the example of a Knucklehead: 37 EL 2318) Identification Number was mandated by law. This scheme was used until the 1970's when 17-digit Vehicle The serial number is stamped into the engine. Sometime back in the teens, Harley-Davidson standardized their serial number scheme. The serial number of your Lightweight is stamped into a raised pad on the left side of the engine crankcase.
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