The item "Intake + exhaust valve Delta 72 JYMP" 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. Manufacturer: JYMP. If the old part has a marking, compare it with the name in the product listing.
