ProX Steel Intake Valve Conversion Set 28.SIS4341-2 for Kawasaki KX250F

Latest addition to the ProX program is the Steel Intake and Exhaust Valve & Spring Kits. This kit is offered as an alternative where the OEM application uses Titanium valves. ProX has now developed the Steel Intake and Exhaust Valve & Spring Kits, containing a set of steel intake or exhaust valves plus a set of specially designed stronger valve springs. The ProX kit just replaces the OEM valves & valve springs and can be installed using the OEM retainers, bases and valve seals.

The ProX Steel Intake Valve Conversion Set, manufacturer part number 28.SIS4341-2, provides a durable replacement for OEM titanium intake valves and valve springs. Designed for Kawasaki KX250F applications from 2011 through 2016, this complete conversion kit is engineered for riders and technicians seeking dependable performance under demanding engine conditions.

Each kit includes steel intake valves and specially designed stronger valve springs to accommodate the additional weight of steel components. The nitrided valves provide high microhardness and a smooth surface finish that helps reduce friction between the valve stem and guide. Premium chrome vanadium steel springs are designed to support reliable operation and durability at high engine speeds.

Installation is straightforward because the ProX kit is designed to work with the original equipment retainers, bases, and valve seals. No additional engine modifications are required, allowing the cylinder head to be fully rebuilt with commonly retained OEM components. The complete package supports a practical and cost-efficient replacement solution for maintaining the valve train of compatible Kawasaki motocross motorcycles.

Fitment: 2011 Kawasaki KX250F; 2012 Kawasaki KX250F; 2013 Kawasaki KX250F; 2014 Kawasaki KX250F; 2015 Kawasaki KX250F; 2016 Kawasaki KX250F.

Features:

• Steel intake valves provide increased durability and reduced wear under extreme operating conditions.
• Nitrided valve surfaces deliver high microhardness and a smooth finish that helps reduce stem-to-guide friction.
• Stronger valve springs are engineered to accommodate the added weight of steel valves.
• Compatible with OEM retainers, bases, and valve seals without requiring additional engine modifications.
• Chrome vanadium steel springs support performance and durability at high engine speeds.
• Complete conversion package enables a straightforward replacement of the original titanium valve and spring components.
• Brand: ProX.
• Manufacturer part number: 28.SIS4341-2.
• Vendor part number: 28.SIS4341-2.
• Model: Steel Intake Valve Conversion Set.
• Fitment: 2011–2016 Kawasaki KX250F.

Fitment:
2011 Kawasaki KX250F
2012 Kawasaki KX250F
2013 Kawasaki KX250F
2014 Kawasaki KX250F
2015 Kawasaki KX250F
2016 Kawasaki KX250F