PROX offers a steel exhaust valve conversion kit designed to meet the needs of GAS GAS ECF 450cc, YAMAHA WRF 450cc, YAMAHA YFZ 450cc, YAMAHA YFZR 450cc, YAMAHA YZF 450cc motorcycles. Made from high-grade steel, this kit offers exceptional resistance to heat and mechanical stress generated by high revs. Thanks to its precision machining and optimum fit, it ensures perfect sealing, smoother combustion and longer service life than original valves. Ideal for motocross, enduro or competition riders, it guarantees consistent, reliable performance, even in the most extreme conditions.

Fits on :

GAS GAS ECF 450 2015

GAS GAS ECF 450 2014

GAS GAS ECF 450 2013

YAMAHA WRF 450 2004

YAMAHA WRF 450 2003

YAMAHA WRF 450 2005

YAMAHA WRF 450 2006

YAMAHA WRF 450 2007

YAMAHA WRF 450 2011

YAMAHA WRF 450 2010

YAMAHA WRF 450 2009

YAMAHA WRF 450 2008

YAMAHA WRF 450 2015

YAMAHA WRF 450 2014

YAMAHA WRF 450 2013

YAMAHA WRF 450 2012

YAMAHA YFZ 2WD 450 2009

YAMAHA YFZ 2WD 450 2008

YAMAHA YFZ 2WD 450 2007

YAMAHA YFZ 2WD 450 2006

YAMAHA YFZ 2WD 450 2005

YAMAHA YFZ 2WD 450 2004

YAMAHA YFZR 2WD 450 2021

YAMAHA YFZR 2WD 450 2020

YAMAHA YFZR 2WD 450 2019

YAMAHA YFZR 2WD 450 2018

YAMAHA YFZR 2WD 450 2017

YAMAHA YFZR 2WD 450 2016

YAMAHA YFZR 2WD 450 2015

YAMAHA YFZR 2WD 450 2014

YAMAHA YFZR 2WD 450 2013

YAMAHA YFZR 2WD 450 2012

YAMAHA YFZR 2WD 450 2011

YAMAHA YFZR 2WD 450 2010

YAMAHA YFZR 2WD 450 2009

YAMAHA YFZR SPECIAL EDITION 2WD 450 2021

YAMAHA YFZR SPECIAL EDITION 2WD 450 2020

YAMAHA YFZR SPECIAL EDITION 2WD 450 2019

YAMAHA YFZR SPECIAL EDITION 2WD 450 2018

YAMAHA YFZR SPECIAL EDITION 2WD 450 2017

YAMAHA YFZR SPECIAL EDITION 2WD 450 2016

YAMAHA YFZR SPECIAL EDITION 2WD 450 2015

YAMAHA YFZR SPECIAL EDITION 2WD 450 2014

YAMAHA YFZR SPECIAL EDITION 2WD 450 2013

YAMAHA YFZR SPECIAL EDITION 2WD 450 2012

YAMAHA YFZR SPECIAL EDITION 2WD 450 2011

YAMAHA YFZR SPECIAL EDITION 2WD 450 2010

YAMAHA YFZR SPECIAL EDITION 2WD 450 2009

YAMAHA YFZ SPECIAL EDITION 2WD 450 2009

YAMAHA YFZ SPECIAL EDITION 2WD 450 2008

YAMAHA YFZ SPECIAL EDITION 2WD 450 2007

YAMAHA YFZ SPECIAL EDITION 2WD 450 2006

YAMAHA YFZ SPECIAL EDITION 2WD 450 2005

YAMAHA YFZ SPECIAL EDITION 2WD 450 2004

YAMAHA YZF 450 2003

YAMAHA YZF 450 2004

YAMAHA YZF 450 2005

YAMAHA YZF 450 2009

YAMAHA YZF 450 2008

YAMAHA YZF 450 2007

YAMAHA YZF 450 2006