Supertech 2015 Yamaha YZF250 25.5x4.46x82.4mm (+0.5mm) 50 Deg Seat Angle Ti Exh Valve - Single

If you're rebuilding the top end of your 2015 Yamaha YZF250, a fresh exhaust valve is crucial for restoring proper compression and performance. This single exhaust valve from Supertech is made from titanium, which is lighter and stronger than stock steel valves, helping to reduce valve float at high RPMs. It measures 25.5mm in diameter, has a 4.46mm stem, and is 82.4mm long, with a 50-degree seat angle. This specific valve is 0.5mm oversized, designed to be used when the valve seat has been re-machined to a larger diameter.

Titanium construction offers improved durability and heat resistance compared to standard materials, making it a solid choice for performance-oriented engine work. The precise dimensions and 50-degree seat angle ensure it mates correctly with the cylinder head's valve seat for a good seal. Using an oversized valve like this can help regain lost compression if the original valve seat has been worn or damaged beyond the limits of a standard-sized valve.