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PROX Valve and Spring Kit 28.SES4409-1

Part Number: 09261034
PROX
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SKU:
09261034
MPN:
28.SES4409-1
Condition:
New
Availability:
Ships Same Business Day
Weight:
0.30 LBS
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MSRP: $166.95
Now: $136.00
Was: $166.95
— You save $30.95
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Description

If you're pushing your engine beyond stock parameters, OEM valves and springs will become your bottleneck. The PROX 28.SES4409-1 replaces factory components with nitrided steel valves and premium chrome vanadium springs engineered to handle extreme RPMs and sustained high-load conditions without fatigue or failure. This kit bolts directly into your existing setup using OEM retainers, bases, and seals—no machine work required.

Built for serious builders and racers who demand reliability under stress, these components eliminate the weak link in your cylinder head and unlock the full potential of forced induction, high-rev builds, and aggressive tuning.

  • Nitrided steel valves
  • Increased hardness and wear resistance
  • Chrome vanadium valve springs
  • Premium spring material
  • High-RPM rated design
  • Handles increased valve weight
  • Compatible with OEM retainers
  • Compatible with OEM bases
  • Compatible with OEM seals
  • Intake or exhaust configuration
  • Bolt-on installation
  • No machine work needed
  • MPN: 28.SES4409-1
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Specs

MATERIAL:
STEEL
RIDING STYLE:
OFF-ROAD
UNITS:
KIT
APPLICATION:
EXHAUST
PRODUCT NAME:
SPRING KIT
TYPE:
VALVE
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Fitment

Fitment for PROX Valve and Spring Kit 28.SES4409-1

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Big Power, Nice Sound!

Picked up a Pro Circuit pipe and silencer for my YZ125 it’s a game changer. The power feels way better and the sound is awesome.

Tyler D. - 06/12

Perfect Fit

First time ordering here and dang y’all knocked it outta the park! The wheels fit my Ranger UTV perfect, and I’ll definitely be back for more 5 stars all day!

Sarah L. - 08/24

Fast Shipping!!

Ordered on a Monday, and it was on my doorstep by Wednesday! Super impressed with how fast the shipping was.

Jason P. - 09/13

Helps keep cool, works great!

Bought the dual pass Allstar radiator for my build, and it’s been solid. Keeps the engine running cool even on the hottest days no complaints here!

Jake M. - 05/21

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