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The Model W engine was Harley-Davidson's first flathead engine, [7] and its transmission was the first in a Harley-Davidson motorcycle to be housed in the engine cases. [ 6 ] [ 8 ] The transmission included helical gear drive, a wet clutch, and a three-speed gearbox. [ 8 ]
The formula specifies that a cyclekart is a one-seat car using Honda 17 × 1.75 or 2 inch (432 × 44 or 51 mm) rims, 17 × 2.50 (432 × 64 mm) tires, a 38-inch (965 mm) track, wheelbase as close to 66 inches (1676 mm) as the aesthetics of the car will allow, weight no more than 250 lbs (113 kg), and powered by a 200 cc class, single cylinder, 6 ...
A 1955 Model B "Hummer" at the Harley-Davidson Museum. The Hummer was added to Harley-Davidson's model line in 1955. It was a stripped-down basic model using a redesigned "B-model" engine with the old 125 cc capacity. It was named after Dean Hummer, a Harley dealer in Omaha, Nebraska who led national Harley two-stroke sales. [2]
The engines are from 1-cylindered production motorcycles and mx motorcycles. 85 up to 250 cc are two stroke engines while 650 class goes with 4-stroke. From 2022 4-stroke 250cc engine is allowed in 125 class (swe class 2) and 450cc 4-stroke in 250cc class (swe class 3). [1] In the mini class the boys and girls from age of 6 years can compete.
The MZ two-stroke engines, developed by engineer Walter Kaaden, have influenced motorcycle racing for decades. His 1961 125 cc race engine design was the first to achieve an output of 200 bhp (150 kW) per litre. [3] His revolutionary two-stroke system was copied widely in the 1960s by Japanese manufacturers.
The model number breaks down as follows: W : the W family of motorcycles. Harley-Davidson (except in very early models) gives a letter designation for each model family. The W series at the time was the newest incarnation of the 45-cubic-inch (740 cm 3) flathead motor, and was developed from the earlier R family 1932–1936.
It was designed as a mirror image of the RT 125, so that the gearchange was on the right side, in conformity with other British motorcycles of the period, [2] and with measurements changed from metric to inches. [1] The model Bantam, the D1, was launched in 1948 outside of the UK and in 1949 within the UK. It was in production until 1963. [3]
The RT 125 was a German two-stroke motorcycle made by DKW in Zschopau in the 1930s, IFA and MZ in the 1950s and early 1960s, and DKW in Ingolstadt in the 1950s and 1960s. "RT" stands for German : Reichstyp , English: Realm Type .