Wikipedia sez: 1999-2002 2003 2004 2005 2006 2007 2008 2009 Engine Engine Type 645 cc (39.4 cu in), four-stroke, liquid-cooled, 90° V-twin, DOHC, 8-valves, TSCC[clarification needed] ~ 2 spark per cylinder Bore x stroke 81.0 × 62.6 mm (3.19 × 2.46 in) Course they could be wrong too. Check it out: http://en.wikipedia.org/wiki/Suzuki_SV650