Prox Steel INTAKE Valve/Spring Kit

Prox is offering a wide range of titanium into steel conversion kits. The ProX titanium into steel extends 3 times the lifespan up the OEM titanium valves. The kits contain a set of steel intake or exhaust valves plus a set of special designed stronger valve springs. due to the extra weight of the steel valve a heavier valve spring must be used! The ProX kit just replaces the OEM valves & valve springs and can be installed using the OEM retainers, bases and valve seats.

Yamaha YFZ450 (2004-2009), Yamaha YZ450F (2003-2009), Yamaha WR450F (2003-2015), Yamaha YFZ450R (2009-2015), Gas-Gas EC450F (2013-2015),

PROX 28.SIS2424-2