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Honda VT500
VT500 is a common name for the family of Honda motorcycles sharing the VT500 inline V-twin engine. Launched at the Cologne motorcycle show in September 1982, it was produced with various designations for different countries, such as Ascot, Shadow and Euro.
==Design parameters==
Conventional V twin engines often had the fore and aft cylinders set at 90-degrees to reduce the primary engine vibration, which in turn created a bulky, long engine requiring a long-wheelbase frame.
Honda briefed their engineers to produce a compact, inline V twin engine with any angle narrower than nintety degrees, but leaving enough space between the cylinders to locate conventional carburetors with the airbox located under the fuel tank, to maintain a slim-profile without side-facing carburetors associated with some marques. The optimal design was found to be with cylinder angle set at 52 degrees, but additionally having offset crankpins to achieve acceptable levels of vibration reduction without the need for additional balancing shafts which would have added weight and reduced power. The narrow-V engine was compact and at the time was one of the lightest and narrowest, enabling a frame design offering good manoeuvrability.〔''Motor Cycle News'' 22 September 1982, pp.1, 3, 27-29 ''Special issue, Europe's biggest bike show.'' Accessed and added 2015-03-08〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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