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Air Cut Valve Gasket For Yamaha SR500 XT500 29-020

Gasket for Air-Cut Valve (OEM Part No. 2H0-14958-00-00 Diaphragm) or Mikuni's Air Cut Valve used on 1978-1989 SR500 and 1980-1981 XT500 as seen below
Cuts the air inlet in gas throttling, thus ensures the enrichment of mixture and the fuel air mixture gets lightly raised enriched. 

Applications of Gasket:
SR500 1978-1981
Possibly XT500 as well.