ProX Steel Intake Valve Conversion Set 28.SIS1337-2 for 2008-2009 Honda CRF250R

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.SIS1337-2, is designed for the 2008 and 2009 Honda CRF250R. This complete intake valve and spring kit provides a durable alternative for applications originally equipped with titanium intake valves. It includes steel intake valves and specially designed high-performance valve springs engineered to accommodate the additional weight of steel valves.

ProX nitrided steel valves offer increased microhardness and a smooth surface finish to help reduce friction between the valve stem and guide. The premium chrome vanadium steel springs provide improved performance and durability at high RPM, making this kit suitable for demanding motocross and off-road engine use. The components are developed as a direct replacement for the original equipment intake valves and valve springs.

Fitment: This ProX conversion set fits 2008 Honda CRF250R and 2009 Honda CRF250R models. Installation can be completed using the OEM retainers, bases, and valve seals, with no additional engine modifications required. The complete package supports a straightforward, cost-efficient top-end service and allows the cylinder head to remain fully rebuildable with compatible OEM components. Verify the motorcycle model and engine application before installation to ensure proper fitment.

Features:

• Application: Intake valve conversion set for 2008-2009 Honda CRF250R models
• Construction: Durable nitrided steel intake valves designed for reduced wear under extreme operating conditions
• Surface finish: Smooth valve stems help minimize friction between the stem and valve guide
• Valve springs: Stronger premium chrome vanadium steel springs engineered for the added weight of steel valves
• Installation: Uses OEM retainers, bases, and valve seals without requiring additional engine modifications
• Package: Complete valve and spring kit for efficient replacement and engine rebuilding
• Brand: ProX
• Manufacturer part number: 28.SIS1337-2
• Vendor part number: 28.SIS1337-2

Fitment:
2008 Honda CRF250R
2009 Honda CRF250R