I have a 1989 Mercury 9.8 and it doesn't have the plastic venturi in the throat of the carburetor. The previous owner said he lost it but the motor runs good. I didn't try to run it like this. Now my question is, does it have to be in there? What does it do? And what would my problems be by not having it in? Reason why I ask is, I can't find one. Tried the carb kit and just the venturi and everyone tells me the kit and venturi are discontinued. Thinkin about just lookin for a used carb.