Moto Tassinari VForce4X Valve System V4X26AM-I for 2024–2025 KTM, GasGas and Husqvarna Models

Moto Tassinari has extracted more power and more performance from our already proven Vforce3 reed valve system design for the 85cc market, by offering the all-new Vforce3i with integrated intake boot (included on CR, RM & YZ models only). the Vforce3i shares many of the same features as it’s legendary big brother, along with these additional unique features

The Moto Tassinari VForce4X Valve System, manufacturer part number V4X26AM-I, is designed to improve throttle response, fuel-air distribution and overall engine performance on select 2024–2025 off-road motorcycles. Built around Moto Tassinari’s proven reed valve technology, this system helps optimize airflow into the engine while providing consistent reed operation under demanding riding conditions.

Fitment: This VForce4X valve system fits the 2024 KTM 150 XC-W, 2024 KTM 250 XC-W, 2024 KTM 300 XC-W, 2024 GasGas EC 250, 2024 GasGas EC 300, 2024 Husqvarna TE 150i, 2024 Husqvarna TE 250i, 2024 Husqvarna TE 300i, 2025 KTM 250 EXC and 2025 KTM 300 EXC. Verify the motorcycle model and year before installation to ensure proper compatibility.

The system uses a performance-focused reed cage and reed petal design to support responsive engine operation across the powerband. Its engineered airflow path promotes more even fuel and air distribution into the engine cases, while the reed control components help maintain stable petal movement. The result is a durable replacement or upgrade for riders seeking dependable performance from a modern two-stroke engine.

Manufactured by Moto Tassinari, the VForce4X Valve System is identified by manufacturer and vendor part number V4X26AM-I. Installation should follow the motorcycle manufacturer’s service procedures and Moto Tassinari’s product instructions. Inspect all intake connections and sealing surfaces during installation to help ensure reliable operation.

Features:

• Straight-shot airflow path: Promotes a direct route into the engine cases for more consistent fuel and air distribution.
• Stabilized reed operation: Engineered reed stops help control reed petal opening for predictable performance.
• Performance reed petals: The reed cage design supports lighter reed petals for improved throttle response and engine performance.
• Model-specific integration: Designed for compatible KTM, GasGas and Husqvarna two-stroke applications.
• Brand and part number: Moto Tassinari VForce4X Valve System, manufacturer and vendor part number V4X26AM-I.

Fitment:
2024 Gas-Gas EC 250
2024 Gas-Gas EC 300
2024 Husqvarna TE 150i
2024 Husqvarna TE 250i
2024 Husqvarna TE 300i
2024 KTM 150 XC-W
2024 KTM 150 XC-W TPi
2024 KTM 250 XC-W
2024 KTM 300 XC-W
2025 Gas-Gas EC 250
2025 Gas-Gas EC 300
2025 Husqvarna TE 150i
2025 Husqvarna TE 250i
2025 Husqvarna TE 300i
2025 KTM 150 XC-W
2025 KTM 150 XC-W TPi
2025 KTM 250 EXC
2025 KTM 250 XC-W
2025 KTM 300 EXC
2025 KTM 300 XC-W