KIT IN VALVE+SPRING KXF450, PROX 28.SIS4409-2 INTAKE
4.1 Trustpilot 99.9% positive on eBay
Delivery to United States 5–8 business days
Spread the cost with 
ProX Steel INTAKE Valve/Spring Kit contains steel intake valves and specially designed stronger valve springs. This kit replaces OEM valves and springs and can be installed using OEM retainers, bases, and valve seats. The ProX titanium into steel extends lifespan compared to OEM titanium valves. SKU 65-K171.PX. Manufacturer Pro-X Racing. Part number 28.SIS4409-2. Weight 178 grams.
- SKU
- 65-K171.PX
- Brand
- Pro-X Racing
- Availability
- In Stock (1)
Fitments (10)
| Make | Model | Year |
|---|---|---|
| KAWASAKI | KX 450F | 2009 |
| KAWASAKI | KX 450F | 2010 |
| KAWASAKI | KX 450F | 2011 |
| KAWASAKI | KX 450F | 2012 |
| KAWASAKI | KX 450F | 2013 |
| KAWASAKI | KX 450F | 2014 |
| KAWASAKI | KX 450F | 2015 |
| KAWASAKI | KX 450F | 2016 |
| KAWASAKI | KX 450F | 2017 |
| KAWASAKI | KX 450F | 2018 |
- General Product Group
- Cam & Valvetrain
- General Product Type
- Valve & Spring Kit
- Variant Id
- 264487
FULL DESCRIPTION
ProX Steel Intake Valve and Spring Kit
Enhance the durability and lifespan of your engine with the ProX Steel Intake Valve and Spring Kit. This kit is designed to replace OEM titanium valves with high-strength steel valves, offering up to three times the longevity of standard titanium components.
Each kit includes:
- High-performance steel intake valves
- Specially designed, stronger valve springs to accommodate the increased weight of steel valves
The ProX Steel Intake Valve and Spring Kit is engineered for direct installation, utilizing your original retainers, bases, and valve seats. This conversion offers a robust and cost-effective upgrade for your engine's valvetrain.
Key Features:
- Durable steel construction for extended lifespan
- Includes stronger valve springs for optimal performance
- Direct replacement for OEM valves and springs
- Utilizes original engine components for installation
QUESTIONS? JUST ASK
Talk to John or Phil. Real people, Monday to Friday, 10:00 to 17:00 (UK time).
Check the fitment table on this page against your make, model and year. Not sure? Call or email us and we will check it for you before you order.
Yes. We ship from the UK. Orders ship within 3 working days, then delivery to the United States takes 5–8 business days. The delivery price is shown at checkout before you pay. Delivery details
Yes. You have 14 days from delivery to return it, unused and in its original packaging. Contact us first and we will send you the return instructions. Returns policy
By card, PayPal, Apple Pay or Google Pay, or spread the cost with Klarna. Payment is taken securely by Stripe, and the options for your order are shown at checkout.
Any customs duties or import taxes charged in the United States are paid by you when the parcel arrives. Any tax we collect ourselves is shown at checkout before you pay.
More answers in our FAQ.
Trade pricing available
Buying parts for your business? Apply for a 2BrosParts trade account.