Moto Tassinari V-Force 4 Reed Valve System Banshee 350'87-06 V4144-2. Yamaha RD250, 350 & 400 owners please note: Installing these reed valves will require modification of the intake port of the cylinders. While the bolt pattern is the same, the valve will not just slide in. Material removal on the intake port walls will be required.The all-new VForce4 is built upon the solid foundation that has made the VForce3 such a success for the last 10 years. While the VForce3 has been continually refined over the years, this is a complete redesign of the entire system. We jokingly say, The only thing we didn't change is the bolt pattern. However this is actually quite true.
All the components that go into making a VForce reed valve system have been significantly changed since the VForce3. The unique design of the VForce reed valve system features double the reed tip surface over a conventional reed valve design. This has two major benefits: 1 The reed petals only travel half the distance as a conventional reed valve design to get the same airflow. 2 Because the reed petals only need to travel half the distance of that on a conventional reed valve design, there is a greater chance of them being fully opened as well as a better chance of sealing when they are "closed". 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 FEATURESDouble 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. Screw free design eliminates risk of screws going through motor. Screw free design enables super quick reed petal changes. NEW AND IMPROVED VFORCE4 FEATURESAll-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. Uses symmetrical reed petals, no more inner and outer petals.
Incorporates the industries first and only patented snap together reed valve design. The entire assembly is completely screw free. Custom air guides specific to each individual application ensures maximum airflow. Utilizes and advances composite technology with an all new carbon fiver lay-up and resin system.
This new lay-up was designed entirely around the reed cage design of the VForce 3 for superior performance and response. New improved reed stop design completely eliminates the need for retaining screws. This feature now removes any possible chance of failure. Airfoil shaped (flat on bottom/curved on top) reed tip surface increases velocity of fuel/air mixture as it passes through, creating the optimum fuel atomization. For MORE GREAT DEALS on powersports parts and accessories!Your friends at MOTOMENTUM appreciate your Business! Were still the same family owned and operated business you know and love. With our growing parts list the Classic Cycle Parts name just didnt seem to fit us anymore. Whether its an impeller for a personal watercraft, a hyfax for a snowmobile, or tires for your UTV, we have you covered! With over 400,000 parts, we have what it takes to keep you moving forward.