Corsair, take off your carburetter ....look down the hole towards engine...you will see some plates made of yellow/green fibreglass..that is reed valve petals
hope this helps

I have mine on bench so here is a picture....

p.s. to check them take of the intake block and make sore the reeds are sitting flat and spring back if lifted (carefully), or blow and suck through the hole where the carb mounts, you should be able to blow, but not suck