- 1). Use brand new gaskets, filters, diaphragms, fuel inlet screen and Welch plugs. Assembling the carburetor without these parts can damage your carburetor.
- 2). Start assembly on the fuel metering side. Screw the carburetor adjustment screws back into their holes. Push the Welch plugs back into their holes with the rubber mallet.
- 3). Insert the metering lever and shaft into the metering chamber and connect them to their post. Seat the spring and needle valve onto the metering lever's arm. Make sure the tip of the metering lever is flush with the floor of the fuel chamber. Correct tip placement is vital for proper carburetor function. Incorrect tip placement will cause erratic acceleration and deceleration.
- 4). Place the metering diaphragm gasket against the inside of the fuel chamber. Set the metering diaphragm in place over the gasket. Set the metering cover in place over the diaphragm and screw it in place. Make sure the diaphragm's ventilation hole on the cover is pointing towards the cylinder.
- 5). Press the fuel inlet screen into its seat with the toothpick. Make sure it is flat and tight against the inlet valve. Set the fuel pump's diaphragm into place against the carburetor body first, unlike the metering section where the gasket is first. Place the fuel pump's gasket in place over the pump's diaphragm. Set the cover on top of the gasket and screw it into place.
- 6). Attach the fuel pressure gauge to the fuel inlet valve on the carburetor. Submerge the carburetor into a container of fuel. Pump up the pressure on the gauge to 7.2 psi. No air bubbles should be seen and the pressure should remain at 7.2 psi. Try reseating the needle valve and spring on the lever. If that still doesn't work, you will need to replace the carburetor.
- 7). Attach the throttle and choke valves, with their shafts, into their positions on the bottom end of the carburetor. Reinstall the carburetor onto its mounting plate.
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