Moto Tassinari V417A VForce4 Reed Valve

Moto Tassinari

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Moto Tassinari V417A VForce4 Reed Valve

Applications: Select KTM and Husqvarna 200/250/300 models

KTM MODELS 250SX 2003 and 250/300 EXC/MXC 2004-2006 require 2004 SX intake boot

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.


Year Make Model
2007 KTM 250 EXC
2004-2016 KTM 250 SX
2007-2014 KTM 250 XC
2012, 2016 KTM 250 XC-W
2002, 2003 KTM 300 MXC
2007-2016 KTM 300 XC
2007-2016 KTM 300 XC-W
2014-2016 Husqvarna TC 250
2014-2016 Husqvarna TE 250
2014-2016 Husqvarna TE 300

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.


  • 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


  • 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

Brand: Moto Tassinari
Part Number: V417A

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