V-Force 1987-2000 and 2002 Honda CR125 Reed Valve Kit V4R01D - Langston Motorsports

V-Force 1987-2000 and 2002 Honda CR125 Reed Valve Kit V4R01D

Moto Tassinari

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Honda CR125 V-Force Reed Valve System

CR125 Motor is probably Honda's most popular motor both on dirt bikes and shifter cart racing.  It dominated the 2-stroke motocross circuit for awhile.  With a solid stock racing motor, the stock reed valve lacks that proper control of it's fuel-air mixture to the cylinder.  This is where V-Force Reed Valve System compensates for that.  With it's patented Reed Valve technology, it promotes significant increase in performance from bottom end to top end.  

Applications: Honda CR125

Model Years: 1987-2000 and 2002

The all-new VForce4R for the Honda CR125 offers enhanced reed petal life as well as all the added benefits of the unique VForce reed valve design.

The Moto Tassinari V-Force reed valve system has won countless championships and is the reed valve of choice for Amateur as well as seasoned dirt bike riders.  Ricky Carmichael and James Stewart, to name a few, put these reeds to the test and submitted it to the hardest riding style and getting championship results.  For most people the first step to 2 stroke reed valve tuning is getting rid of that OEM reed valve and replacing it with the Vforce Reed valve system.  The Vforce Reed has a snap together cage using symmetrical reed petals, eliminating the need for different inner and outer replacement petals.  

The VForce reed valve system by Moto Tassinari has been the reed valve system of choice by anyone serious about two-stroke engine performance for the last 10+ years. The simple premise of the VForce3 reed valve system is to increase engine power and throttle response by increasing the efficiency over a conventional reed valve design.

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 are 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 rapid 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


  • Rubber overmodling on reed tip surface of cage to further enhance petal life
  • Pre-curved reed petal ensures better seal at tip


Moto Tassinari and VForce4R decals, detailed installation instructions, complete VForce4R reed valve system (including reed petals) and gaskets.

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