Intake and exhaust valve set for Viper 125-200 cc motorcycles and similar (China, Minsk). The valves open and close the intake and exhaust ports of the cylinder head. The intake valve admits the mixture, the exhaust valve lets out the spent gases. The set contains one intake and one exhaust valve.
Replace the valves if the head has burned through, compression is lost, idling is unstable and there is knocking in the valve train. The dimensions in the name will help you match the part to your head; during replacement the seats are lapped and the clearances are adjusted.
