Reed valve for Yamaha Jog scooters. The reed petals let the mixture into the crankcase on the piston's upstroke and keep it from flowing back. This is the basis of how a two-stroke engine works: the valve creates the vacuum and the mixture supply.
Replace it if the petals have cracks, have lost their springiness or are burned: the engine starts poorly, loses power and does not hold revs. Installation is done carefully.
Reed valve assembly for JOG model 2JK. Country of origin: China.
