<P> The Yamaha Grizzly is a large utility all - terrain vehicle manufactured by the Yamaha Motor Company . It has a 595cc four - stroke engine from the XT600 . Yamaha replaced the Grizzly 600 with the new Grizzly 660 using a larger engine that is 660cc derived from the Raptor 660 with a five - valve cylinder head . </P> <P> Beyond the engine, the biggest differences between the Grizzly 600 (offered in the US from 1998 to 2001) and the Grizzly 660 (introduced in 2002), is the rear suspension . The older Grizzly has a rigid rear axle with a single shock . The newer Grizzly has independent rear suspension with dual shocks . This is reported to have significantly improved the handling characteristics of the newer model . The Grizzly includes push button 4 wheel drive and diff lock . </P> <P> In 2007 Yamaha came out with the Grizzly 700 that provides fuel injection and optional EPS (electric power steering), that has been getting great reviews . Also, the 700 uses "gull wing" bent axle on the rear, allowing for a shorter frame, and reduced weight . </P>

When did yamaha grizzly go to fuel injection