The ATV Clutch Cvt Driven Pulley Helix Spring, designed with precision for Out400, 450, and 650 models, is a key component that ensures smooth and reliable operation. This heavy-duty pulley system is equipped with a high-strength spring, adjusting to various clutch requirements and belt angles. Its helix design, along with a robust shaft, guarantees a secure fit, reducing noise and vibration. The clutch pulley's clever configuration also offers optimal mounting, making it easy to install and maintain. So go ahead and upgrade your ATV's clutch performance with this reliable and durable solution, knowing you're making a smart choice.