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When I push the primer blub, gas comes out a hole on other side of carb. I put my finger over hole and primer works good. it doesnt change running when hole is plugged. B&S #10A902- 2291- B1/ 550 series. Also when I took shroud off it ran better, whats its for , just to look good :confused3:?

First, check the float level, it is probably set to high and when priming you are pushing fuel out of the float bowl vent. Second, the shroud is a major part of the cooling system and running an engine with it removed you are asking for an early death of our engine.