reeds not sealing????

[fs5]

I was doin some work on my motor yesterday and thought i'd pull the plugs and do a comp test.
when I was pulling it over,it made a croaking sound coming out the carbs.never done this before.could this be air pushing back through the reeds?
when I run the motor,no fuel sprays back out the carbs.
i'm running ccms reeds in it.
the motor has been a bit slow out of the hole lately ,but once it up and runnin ,it still goes hard.

[zul8tr]

Maybe the (plastic, carbon?) reeds are frayed? If easy to inspect look at them?

[DuckLn]

Yep or the reed cage needs to be lapped as the rubber invariably swells around the mounting screws