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Lift the lid, and our Q-jet's internals are in plain view. The top of the power piston assembly protrudes through the air-horn gasket, so be careful when peeling it off. Once the gasket is out of the way, the power piston and the attached primary metering rods pull right out. Don't forget the power piston assembly spring underneath; it might be easier to get at once the fuel-bowl insert and float-and-needle assembly are removed.