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Honda xr650L with benelli tank

November 05, 2014

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America got the Xr650L but much of the world knows it by the name Dominator.

http://freelancethink.blogspot.com/2011/07/streetstyle-urban-dualsport-in-valencia.html

honda NX650 dominator Honda xr650L

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Researching the air-cooled Honda XR650 L engine I came across the acronym RVFC cast into the valve head. RVFC or Radial Four Valve Combustion was a proprietary valve arrangement created by Honda to make a four valve head flow more like a hemi head. Honda RVFC or Radial Four Valve Combustion, splays the valves radially away from the bore's axis and creating a hemispherical combustion chamber when viewed from the engine's profile. The splayed valves arrangement allows quicker flame propagation across the combustion chamber, allowing the engine to produce more power at a given RPM. Additional benefits include better cooling and the engine's timing can be more radically advanced. MV Agusta's new 750cc inline-four uses a radial valve configuration because the engine utilizes a small stroke relative to its bore. A smaller stroke will allow an engine to rev to higher RPMs and produce large amounts of horsepower but when we reduce an engine's stroke it will produce l

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