I was reading my manual for my 1979 Evinrude 150 V6 last night and it indicated that when I remove the air silencer cover to get to the carbs I should remove the gasket and discard it. It also said I should discard the gasket between the air silencer and the carbs. I've had my air silencer off before and there are no gaskets. Should there be gaskets and what problems might it cause not having any gaskets.