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the primary chaincase can be lighter and more compact. the primary chaincase can be shorter, so that wheelbase may also be shorter. engine and transmission are now much more accurately aligned to each other in the frame, improving primary drive life. the engine is cleaner and fashionably modern in appearance (compared to earlier designs).
AJS racing motorcycle showing typical pre-unit construction engine and gearbox layout with mounting plates, slotted holes and screw-thread adjusters visible. Pre-unit construction, [1] also called separate construction, is a motorcycle engine architecture where the engine and gearbox are separate components with their own oil reservoirs, linked by a driving chain within a primary chaincase.
Recirculating oil system introduced on all H-D engines in 1936, R became W to denote this. WLA and WLC were military models, WR was a racing model Servi-Car: 45.1 cu in (739 cc) flathead 1932–1936 (R-series engine) 1937–1973 (W-series engine) From 1964, the first Harley-Davidson to have electric starting. [2] Model K and KK
Engines with more cylinders for the same displacement feel smoother to ride. Engines with fewer cylinders are cheaper, lighter, and easier to maintain. Liquid-cooled motorcycles have a radiator which is the primary way their heat is dispersed. Coolant or oil is constantly circulated between this radiator and the cylinder when the engine is running.
Harley-Davidson was slow to capitalize on this demand, finally introducing the Sportster XR-1000 street bike for the 1983 model year, 13 years after the XR-750 racer. The XR-1000 used XR-750 heads, but kept the Sportster engine, frame and other equipment. [ 10 ]
Harley-Davidson engines are now made at Harley-Davidson Motor Company's Pilgrim Road Powertrain Operations facility in Menomonee Falls, Wisconsin. The company's founders started making smaller flathead motorcycle engines individually by hand and fitted to bicycles in the 10 ft x 15 ft wooden barn in Milwaukee that was the Harley-Davidson ...
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