I am rebuilding the carbs on my 657X, using 35-160 kits. when I took them apart the lower side was different from one to the other. I know one has the pump and the other doesn't. But what concerns me is the the one without the pump, did not have the rubber gasket the the other one had, it had the O ring but no gasket like the pump side, see attached pictures. is this correct or does there need to be the rubber gasket as well as the O ring set up?
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