Product description
The Prox Valve & Spring Kit For Yamaha YZF450 2014-2015 Exhaust - Steel is part of the latest collection from Prox.
Features:
- Replaces the OEM valves and valve springs
- Steel, nitrided valves for increased durability and less wear under extreme conditions
- Stronger valve springs deal with the extra weight of the steel valves
- Springs are made from premium chrome vanadium steel for higher performance and durability at high rpm
- Kit contains a set of steel intake or exhaust valves plus a set of specially designed valve springs; can be installed using the OEM retainers, bases and valve seals
Specifications:
- Application: Exhaust
- Color/Finish: Steel
- Material: Steel
- Product Name: Valve and Spring Kit
- Units: Kit
To fit:
- YAMAHA YZ 450 F 2014 American Models
- YAMAHA YZ 450 F 2014 European Models
- YAMAHA YZ 450 F 2015 American Models
- YAMAHA YZ 450 F 2015 European Models
Manufacturer part number: 28.SES2444-1
View all Prox. View all Parts and spares.
Contents
Your package will include the following:
- 1 X Prox Valve & Spring Kit For Yamaha YZF450 2014-2015 Exhaust - Steel
To fit:
- YAMAHA YZ 450 F 2014 American Models
- YAMAHA YZ 450 F 2014 European Models
- YAMAHA YZ 450 F 2015 American Models
- YAMAHA YZ 450 F 2015 European Models

ProX is a Dutch brand specialising in high-quality replacement parts for motorcycles, motocross, ATVs, and other powersports vehicles. Their range includes pistons, connecting rods, clutch components, bearings, and valves, all manufactured to OEM standards. ProX parts are trusted worldwide for durability, precision, and performance, making them a go-to choice for riders.
Product description
The Prox Valve & Spring Kit For Yamaha YZF450 2014-2015 Exhaust - Steel is part of the latest collection from Prox.
Features:
- Replaces the OEM valves and valve springs
- Steel, nitrided valves for increased durability and less wear under extreme conditions
- Stronger valve springs deal with the extra weight of the steel valves
- Springs are made from premium chrome vanadium steel for higher performance and durability at high rpm
- Kit contains a set of steel intake or exhaust valves plus a set of specially designed valve springs; can be installed using the OEM retainers, bases and valve seals
Specifications:
- Application: Exhaust
- Color/Finish: Steel
- Material: Steel
- Product Name: Valve and Spring Kit
- Units: Kit
To fit:
- YAMAHA YZ 450 F 2014 American Models
- YAMAHA YZ 450 F 2014 European Models
- YAMAHA YZ 450 F 2015 American Models
- YAMAHA YZ 450 F 2015 European Models
Manufacturer part number: 28.SES2444-1
View all Prox. View all Parts and spares.
Contents
Your package will include the following:
- 1 X Prox Valve & Spring Kit For Yamaha YZF450 2014-2015 Exhaust - Steel
To fit:
- YAMAHA YZ 450 F 2014 American Models
- YAMAHA YZ 450 F 2014 European Models
- YAMAHA YZ 450 F 2015 American Models
- YAMAHA YZ 450 F 2015 European Models

ProX is a Dutch brand specialising in high-quality replacement parts for motorcycles, motocross, ATVs, and other powersports vehicles. Their range includes pistons, connecting rods, clutch components, bearings, and valves, all manufactured to OEM standards. ProX parts are trusted worldwide for durability, precision, and performance, making them a go-to choice for riders.































