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The Model 1, more commonly known as Big 4, was a Norton motorcycle made between 1907 and 1954 in various forms. With 633 cc (38.6 cu in), it was the largest and most powerful side-valve engine in the model range and with plenty of low end torque was mostly used to haul sidecars. It was called Big 4 because it was rated at 4 tax horsepower.
A valve extender (black) is fitted between valve stem (brass) and core (silver). Valve extenders can be used to lengthen shorter Presta valves to accommodate deeper and thicker rims, such as those on aerodynamic race wheels. There are two variants of valve extenders depending on whether the Presta core is removable. [6]
American Morris alloy wheels were an option [3] with dual Automotive Products Lockheed disc brakes upfront as standard. [3] The fins of the black painted engine were polished although, like the Triumph TR65 Thunderbird , many alloy cycle parts that had in the past been bright–polished or chromed were now painted satin black. [ 3 ]
Moto Morini is an Italian motorcycle manufacturer founded by Alfonso Morini in Bologna, in 1937.. Earlier, Morini had also manufactured motorcycles together with Mario Mazzetti under the name MM.
Motorcycle suspension Harley-Davidson: Registered trademark [205] for a line of Harley-Davidson motorcycles with a suspension that mimics the appearance of a rigid frame, and has since been used to refer to motorcycles of other makes with hidden rear suspensions as well as bicycles incorporating a rear suspension. [206] Speedo Swim briefs ...
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Cast magnesium disks, produced by one-step hot forging from magnesium alloys ZK60 and MA-14, are also used for many motorcycle wheels. At one time, motorcycles used wire wheels built up from separate components, but, except for dirtbikes, one-piece wheels are more common now. Performance racing motorcycles often use carbon-fibre wheels, but the ...
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