A weakness of the 500cc Indian Bullet engine is the exhaust valve. The diameter of the valve head is often too small for the valve seat, this prevents the valve head from forming a fully gastight seal which can cause a burnt exhaust valve and seat. This exhaust valve is designed with an over-size head. The new valve matches the valve seat correctly, allowing an efficient gas seal. The valve features a slimmer profile, for improved gas flow (similar to our performance valves) and high quality materials. The valve is pulsed nitride treated to give the stem an extremely low co-efficient of friction (the stem is more slippery and so wears less rapidly).