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Key features

  • Engine responseThe V-Force 4R reed valve promotes more responsive acceleration and a sharper response at low and mid-range RPM, to enhance your off-road motocross sessions.
  • Optimised intakeThe pre-curved carbon fibre reeds, enlarged box, and 10.5% longer tail promote airflow and intake sealing.
  • Cross compatibilityDesigned to replace the original box of Honda CR85R and CR80R 2-stroke engines. Installation requires a carburation check after fitting.
Ref : VF00008A / 1009782
Vforce

Vforce 4R Valve box

Recommended retail price: 204,74 €184,20 €

Compatibility

Check that this part fits your motorcycle

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Key features

  • Engine responseThe V-Force 4R reed valve promotes more responsive acceleration and a sharper response at low and mid-range RPM, to enhance your off-road motocross sessions.
  • Optimised intakeThe pre-curved carbon fibre reeds, enlarged box, and 10.5% longer tail promote airflow and intake sealing.
  • Cross compatibilityDesigned to replace the original box of Honda CR85R and CR80R 2-stroke engines. Installation requires a carburation check after fitting.

Features

4R Reed Valve by Vforce

The V-Force 4R reed valve is designed for the 2-stroke engines of Honda CR85R and CR80R motocross bikes. Its carbon fibre reeds, enlarged box, and entry profile enhance airflow and provide a more responsive engine performance. It is aimed at off-road riders seeking increased acceleration responsiveness and agility at low and mid-range RPM.


Design and Materials

  • Pre-curved carbon fibre reeds improve intake sealing and help extend their lifespan.
  • The enlarged box and 10.5% longer reed tip promote airflow for a more responsive engine.
  • The overmoulded rubber at the reed tips and the extended stop limit gradual wear of the assembly.

Usage and Performance

  • The aerodynamic entry profile accelerates airflow towards the external intake ports to enhance RPM increase.
  • The 15.6% reduction in the frontal area of the central reed refines throttle response at low and mid-range RPM.

Installation and Mounting

  • Designed to replace the original reed valve on Honda CR85R and CR80R, it integrates with a compatible engine configuration.
  • Mounting on a 2-stroke engine requires a carburetion check to adjust the settings after installation.
  • The manifold, box, and air deflector are tailored for the V-Force 4R system to ensure consistent intake.
  • Manufacturer reference V4R81A

Examples of Compatible Bikes

  • HONDA CR 85 R
  • HONDA CR 80 R

    • Full list of compatible bikes available in the dedicated section below