Ron Wood Racing has been involved with the Yamaha brand since the early '80s, utilizing components on Wood-Rotax dirt track and road race motorcycles. With the switch from 600 to 505 dirt track singles, the YZ motor was soon used to build a dirt tracker, where reliability and power were both very important, with racers holding the throttle wide open for as much as 18 laps on a mile oval. Carrying that knowledge over to the ATVs was a logical step. Our Stage One kit for the YFZ450 gained 28% more power than stock, just bolting on external parts. Soon the Rhino 660 was improved, doubling the horsepower with bolt ons. When power and reliability are important, our parts are the best.