http://motorcycle-glossary.com/port-timing/259 Motorcycle definitions for riders who would rather be riding Thu, 03 Jun 2010 20:36:24 -0400 http://wordpress.org/?v=2.8.4 hourly 1 http://motorcycle-glossary.com/port-timing/259/comment-page-1#comment-133 Timing : Motorcycle-Glossary.com Sun, 20 May 2007 21:26:07 +0000 http://motorcycle-glossary.com/port-timing/259#comment-133 [...] Measurement of the exact instant when the valves open or close in an internal-combustion engine, or when the spark occurs. It is normally expressed in degrees or millimetres before TDC (see ignition timing and port timing). [...] [...] Measurement of the exact instant when the valves open or close in an internal-combustion engine, or when the spark occurs. It is normally expressed in degrees or millimetres before TDC (see ignition timing and port timing). [...]

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