ProX 28.SIS4341-2 Steel Valve and Spring Kit

The ProX Steel Valve and Spring Kit delivers enhanced durability and performance for high-performance four-stroke engines. Engineered to outlast OEM titanium valves by up to three times, this complete valve train solution is designed for riders who demand reliability under extreme conditions.

Key Features:

• Nitrided steel valves with high microhardness for exceptional wear resistance
• Supersmooth surface finish reduces friction between valve stem and guide
• Premium chrome vanadium steel springs rated for high-RPM performance
• Stronger valve springs optimized for the additional mass of steel valves
• Fully compatible with OEM retainers, bases, and valve seals
• Direct replacement requiring no additional engine modifications

This kit includes both intake and exhaust valves with matching springs, providing a complete valve train refresh. The nitriding process creates a hardened surface layer that significantly extends valve life while maintaining precise tolerances. Ideal for racers and enthusiasts seeking improved reliability without sacrificing performance.