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ProX 28.SIS2414-2 Steel Intake Valve and Spring Conversion Kit

(2014-2018 Yamaha YZ250F Base; 2015-2019 Yamaha YZ250FX Base; 2015-2019 Yamaha WR250F Base)

Part of: ProX Steel Intake Valve Spring Conversion Kit

Other options in this family: ProX 28.SIS2444-2

Manufacturer

Picture for manufacturer ProX

Part Number

28.SIS2414-2
11 reviews
Sale Price

$139.99

3 left at this price

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Usually delivered within 2 days

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Live-in-stock inventory

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Fitment guaranteed

Fitment guaranteed

Product Details

The ProX Steel Intake Valve and Spring Conversion Kit provides a durable upgrade from OEM titanium valves, designed for riders who demand reliability under extreme conditions. This TI-STEEL conversion set replaces factory valves and springs with heavy-duty steel components engineered for increased longevity and consistent performance.

Key Features:

  • Steel nitrided intake valves offer superior durability and reduced wear compared to titanium under high-stress conditions
  • Specially designed valve springs made from premium chrome vanadium steel to accommodate the additional weight of steel valves
  • Enhanced spring strength delivers reliable performance and durability at high RPM operation
  • Complete kit includes steel intake valves plus matching performance valve springs
  • Direct installation using OEM retainers, bases, and valve seals—no additional components required

This conversion kit is ideal for riders seeking maximum durability and reduced maintenance intervals, particularly in demanding off-road, racing, or high-temperature environments where valve life is critical.

Products specifications

Fits

2014-2018 Yamaha YZ250F Base; 2015-2019 Yamaha YZ250FX Base; 2015-2019 Yamaha WR250F Base

Great price on product and great price on shipping

Price is great, easy to follow website

First time let you know

awesome

sound cheap of all the online market

everything is great i do wish it would show what day the part will be delivered

great chair for pool table area or any man cave

Best price I found online, I ordered it late Friday and they shipped it on Monday. I would definitely use this site again for future automobile and Motorcycle purchases.

just want to make sure I got the right ones.

Thanks

I placed my order for an Autometer Shift Light and it was shipped the same day. I was provided a FedEx tracking number in the shipping confirmation email. <br><br>Very easy to select what I wanted to buy and the check out process was simple and quick.

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