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The Honda XBR 500 is a 500cc Japanese sports motorcycle launched by Honda in 1985 and in response to the Yamaha SR500. It is powered by a single-cylinder four-valve engine with the valve stem axes arranged radially relative to the geometric centre of the hemispherical combustion chamber - (Honda's Radial Four Valve Combustion Chamber, or RFVC ...
The Honda CBR models are a series of Honda sport bikes introduced in 1983. With the exception of the single-cylinder CBR125R, CBR150R, CBR250R, and CBR300R, ...
The layout of a 4-2-1 system is as follows: four pipes (primary) come off the cylinder head, and merge into two pipes (secondary), which in turn finally link up to form one collector pipe. [2] Compared with a 4-1 exhaust system, a 4-2-1 often produces more power at mid-range engine speeds (RPM), while a 4-1 exhaust produces more power at high RPM.
In 1981 Honda introduced 'Pro-Link’ models, with rising-rate single-shock rear suspension, a 17" rear wheel and a 21" front wheel. Unusual for a four-stroke with its typical intake and exhaust valves, the 1981 and 1982 XR-500 utilized a six-petal reed valve set-up between the carburetor and the intake valves.
When the descending piston first exposes the exhaust port on the cylinder wall, the exhaust flows out powerfully due to its pressure (without assistance from the expansion chamber) so the diameter/area over the length of the first portion of the pipe is constant or near constant with a divergence of 0 to 2 degrees which preserves wave energy.
The Honda 500 twins are a group of straight-twin motorcycles made by Honda since 2013 which use the same 471 cc (28.7 cu in), 180° crank, straight-twin engine, such as the: CB500F naked bike (2013–2024) CB500X adventure touring bike (2013–2024) CBR500R sport bike (2013–present) CMX500 Rebel bobber (2017–present)
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