The item "Intake and exhaust valve Delta 70 cc" is a pair of intake and exhaust valves for Delta mopeds. The valves open and close the intake and exhaust ports at the right moments of the cycle.
Replacement is needed when valves are burnt, compression is lost, or the valve seats poorly. After installation the valves are lapped and the clearance is adjusted. When replacing, inspect the neighboring parts of the assembly: they often wear out together.
