A reed petal never truly "closes" in a classic sense, as it is always in movement. Consider this, an engine operating at 8,000 RPM results in a reed petal opening and closing 133 times in one second. This fact, sheds light on another VForce advantage. Since the petals are only traveling half the distance, they generally last longer as they receive less wear than the reed petals on a conventional reed valve design.STANDARD VFORCE REED VALVE FEATURES Double the reed tip surface over a conventional reed valve design Increased bottom end, stronger mid-range and longer top-end Greater efficiency due to reduced reed petal travel More airflow means more horsepower Reduced reed petal wear Screw free design eliminates risk of screws going through motor Screw free design enables super quick reed petal changes NEW AND IMPROVED VFORCE4 FEATURES All-new reed petal resin system, carbon fiber and lay-up Pre-curved reed petal ensures better seal at tip Wider reed cage for maximum airflow Combined reed tip area increased by 10.5% resulting in increased total air flow Airfoil shape added to cage tip to increase air velocity from outer ports Long reed stops added to progressively slow petal tip velocity, for increased petal durability Reduced frontal area of central wing by 15.6% combined with a more aerodynamic shape. Fitment Notes For 2003KTM250 SX. Please note some of our listings use stock photos which may be slightly different than the actual product. Catalogue Images FOR RAD PART NUMBER: V417A. Your item must be unopened/unused and in the same condition that you received it. It must also be in the original packaging. Any problems with these items need to be reported to RAD POWERSPORTS immediately. If the product is damaged in transit please report damage immediately to us so we can file a claim with the carrier. We also do not accept products that are hazardous materials, or flammable liquids or gases, service manuals or installation videos. If you have questions about fitment please consult us before ordering and we will be happy to do research for you to be sure you are getting the proper fitting product. The responsibility of the user /installer is to verify the fit of all parts prior to installation. Tracking is provided within an hour of your order being boxed.