EC21 Product Catalogs - v twin motorcycle engine http://www.ec21.com/ec-market/v twin motorcycle engine.html New 2009 Yamaha Raider S Motorcyclehttp://antonbarus.en.ec21.com/New_2009_Yamaha_Raider_S--3873433_3873436.htmlEngine Cylinders: 2 Compression Ratio: 9.5:1 Engine Stroke: 4-Stroke Starter: Electric Engine Type: V Twin Displacement20091014