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Message: <blockquote data-quote="jackson409" data-source="post: 59966" data-attributes="member: 381">Reeds are supposed to slam shut so on the up stroke of the piston, fuel/air mixture doesn't get pushed back through the reeds. They need to seal up. So yeah instead of all of your fuel/air mixture getting compressed to the top and getting the most of the bang, you loose some back out the reeds. edit: plus it will cause unwanted fuel/air to leak in if they have a gap. Your piston down stroke sucks in the fuel/air and then it is supposed to slam shut if it doesn't shut more fuel leaks in and then you on your next piston stroke you get more fuel/air then your supposed to causing a rich condition witch will cause a sputtering condtion.</blockquote>