GY6-50 valve 1 Intake valve made of 40Cr, exhaust valve made of 5Cr21Ni4N 2 Surface nitration treatment 3 Non-magnetic GY6-50 Valve This valve fit for all Chinese GY6-50 scooter. We use non-magnetic material to guarantee the quality, intake valve made of 40Cr,exhaust valve made of 5Cr21Ni4N, surface nitration treatment. GY6-50 inlet/exhaust valve,motorcycle parts