... motorcycle engine valve 2.nitriding white/black 3.coupled with valve oil seal(pic as below) 4.customer logo in head motorcycle engine ... valve 150cc, motorcycle engine valve, 150cc intake & exhaust valve Type ... systemChain, sprocket, bearing, wheel, tires, rims, and others.Engine partsCylinder block, cylinder head, crankshaft, camshaft, piston, piston ...