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No, that isn't supposed to happen. The pistons should be able to be raised and drop back when lifted through the choke butterfly hole. Are you installing the plastic ring first? Then drop the piston in, add the spring and then the cap. Maybe there is a burr on the piston top? Or one on the plastic ring? I think the purpose of the plastic ring is twofold, one to provide a cushion when the piston drops, and to provide a seal at the cap and carb body.
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