VForce4R offers enhanced reed petal life as well as all the added benefits of the unique VForce reed valve design. Vforce 4 reed valves are the world leading design and performance reed valve with gains in power no other reed valve standard or aftermarket can match. With a twin stack system you get twice the tip surface and with petals only needing to travel half the distance of a normal single stack, Vforce4 air/fuel control is massively improved when compared to stock.
 
Vforce 3 reed valves are the world leading design and performance reed valve with gains in power no other reed valve standard or aftermarket can match. with a twin stack system you get twice the tip surface and with petals only needing to travel half the distance of a normal single stack, Vforce3 air/fuel control is massively improved when compared to stock
 
CR500 All Years:
V3170B
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.
 
V3170C - New Model
The 2024 reboot of the VFORCE3 for the Honda CR500 utilizes an all-new three port reed cage which offers both greater airflow and improved strength.  The new "C" air guide provides even more airflow.  A redesigned manifold features short reed stops allowing greater range of motion for reed petal travel. And last but not least, fit has been greatly improved.