---
product_id: 65100843
title: "V-Force 4R Reed Valve System V4R04"
brand: "moto tassinari"
price: "$92.37"
currency: USD
in_stock: true
url: https://www.desertcart.us/products/65100843-v-force-4r-reed-valve-system-v4r04
store_origin: US
region: United States of America
---

# Boosts horsepower & mid-range power 10.5% more airflow Screw-free rapid reed petal changes V-Force 4R Reed Valve System V4R04

**Brand:** moto tassinari
**Price:** $92.37
**Availability:** ✅ In Stock

## Summary

> ⚡ Unleash your Yamaha’s true power with the VForce4R – where speed meets endurance!

## Quick Answers

- **What is this?** V-Force 4R Reed Valve System V4R04 by moto tassinari
- **How much does it cost?** $92.37 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/65100843-v-force-4r-reed-valve-system-v4r04)

## Best For

- moto tassinari enthusiasts

## Why This Product

- Trusted moto tassinari brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Durability Meets Innovation:** Rubber overmolding and carbon fiber petals extend reed life and reduce wear
- • **Aerodynamic Reed Cage Design:** 15.6% reduced frontal area with airfoil tips for enhanced air velocity and throttle response
- • **Maximized Airflow Efficiency:** 10.5% increased reed tip area for superior air intake and power delivery
- • **Seamless Performance Upgrade:** Screw-free design enables quick, hassle-free maintenance and zero risk of engine damage
- • **Precision Engineered for Yamaha YZ125:** Custom-fit from 2005 to 2021 models ensuring perfect compatibility and peak performance

## Overview

The Moto Tassinari V-Force 4R Reed Valve System (V4R04) is a precision-engineered upgrade for Yamaha YZ125 (2005-2021), featuring a 10.5% larger reed tip area, advanced carbon fiber and rubber overmolded petals for extended durability, and a screw-free design for rapid maintenance. Its aerodynamic cage design boosts airflow and horsepower, delivering stronger bottom-end torque, mid-range power, and sustained top-end performance.

## Description

Moto Tassinari V Force 4 Reed Valve System ; The all-new VForce4R for the Yamaha YZ125 offers enhanced reed petal life as well as all the added benefits of the unique VForce reed valve design. ; STANDARD VFORCE REED VALVE FEATURES - 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 ; IMPROVED VFORCE4 FEATURES - 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 ; ALL-NEW VFORCE4R FEATURES - Rubber overmodling on reed tip surface of cage to further enhance petal life - Pre-curved reed petal ensures better seal at tip ; Fits on: Yamaha YZ125 ;2005 to 2021

## Features

- Compatible Brand: Fits Yamaha

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Material | Plastic |
| Brand | Moto Tassinari |
| Item dimensions L x W x H | 6.8 x 5.2 x 2.7 inches |
| Exterior Finish | Painted |
| Inlet Connection Size | 1 Inches |
| Inlet Connection Type | Compression |
| Outlet Connection Type | Compression |
| Number of Ports | 2 |
| Outlet Connection Size | 1 Inches |
| Manufacturer | Moto Tassinari |
| UPC | 779423572745 |
| Model | Moto Tassinari V4R04 |
| Item Weight | 0.01 ounces |
| Product Dimensions | 6.8 x 5.2 x 2.7 inches |
| Item model number | V4R04 |
| Is Discontinued By Manufacturer | No |
| Manufacturer Part Number | V4R04 |
| OEM Part Number | 317092 |

## Product Details

- **Material:** Plastic
- **Brand:** Moto Tassinari
- **Item dimensions L x W x H:** 6.8 x 5.2 x 2.7 inches
- **Exterior Finish:** Painted
- **Inlet Connection Size:** 1 Inches
- **Inlet Connection Type:** Compression
- **Outlet Connection Type:** Compression
- **Number of Ports:** 2
- **Outlet Connection Size:** 1 Inches
- **Manufacturer:** Moto Tassinari

## Images

![V-Force 4R Reed Valve System V4R04 - Image 1](https://m.media-amazon.com/images/I/61ctEpn3qnL.jpg)

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-02-11*