Supertech Yamaha YXZ1000/TR1 21.45mm OD 15.25mm ID 47lbs/34.7mm Single Valve Spring Kit

If you're rebuilding the top end of your Yamaha YXZ1000 or TR1, a good set of valve springs is crucial for ensuring proper valve control, especially when you're pushing the engine harder. This single valve spring kit from Supertech is designed to handle those demands. They are well-built to maintain consistent pressure across the RPM range, helping to prevent valve float and ensure the valves close reliably.

This kit features springs with a 21.45mm outer diameter and a 15.25mm inner diameter. Each spring is rated at 47 lbs at 34.7mm installed height, which is a solid specification for many performance-oriented builds. Using a quality valve spring like these helps your engine breathe better and respond more crisply, especially at higher engine speeds. Supertech is known for making reliable engine components, and this spring kit is a popular choice for Yamaha side-by-side enthusiasts looking for an upgrade over stock.