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Harley-Davidson used IOE engines with atmospheric inlet valves until 1912, [12] and with mechanically driven inlet valves from 1911 to 1929. [13] Indian used IOE valvetrains on all of their four-cylinder bikes except those built in 1936 and 1937. [14] [15] Other American motorcycle manufacturers that used IOE engines included Excelsior ...
A racing boot. Similar to touring boots, racing boots are designed for riding a motorcycle on hard pavement (either the street or a race track) and are usually between 10 and 14 inches in height and made from a combination of leather, metal, plastic and/or man-made composite materials to create a form-fitting, but comfortable boot.
Harley-Davidson has used various ignition systems, including the early points and condenser system on Big Twins and Sportsters up to 1978, a magneto ignition system used on some 1958 to 1969 Sportsters, an early electronic with centrifugal mechanical advance weights on all models from mid-1978 until 1979, and a later electronic with a ...
Harley-Davidson Shovelhead engine at the Harley-Davidson Museum. The Shovelhead engine is a motorcycle engine that was produced by Harley-Davidson from 1966 to 1984, built as a successor to the previous Panhead engine. When the engine was first produced, the Shovelhead had a shallower combustion chamber, larger valve drop for both intake and ...
The Harley-Davidson Milwaukee-Eight engine is the ninth generation of "big twin" engines developed by the company, but only Harley's fourth all-new Big Twin in 80 years, first introduced in 2016. These engines differ from the traditional Harley Big Twin engines in that there are four valves per cylinder, totaling eight valves, hence the name.
This had suited Harley Davidson well with their side-valve 750cc K-series V-twins. The AMA raised the limit for ohv engines to 750 cc for 1969 in the flat track class. BSA/Triumph supplied a few triple based flat trackers to selected riders to use on mile circuits, but the triples were too wide and heavy and the riders soon reverted to using twins.
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