How To Change A Carburetor On A Briggs & Stratton Riding Lawn Mower Repair Clinic

How exercise you rebuild or overhaul a minor engine carburetor?

Rebuilding the carburetor may be required if basic adjustments don't fix your pocket-sized engine problems or improve performance on your backyard mower or outdoor power equipment. Follow the steps below for overhauling small-scale engine carburetors.

Alert: Always read the engine and equipment manual(s) before starting, operating, or servicing your engine or equipment to avoid personal injury or holding damage. Fuel and its vapors are extremely combustible and explosive. Always handle fuel with extreme care.

See an authorized dealer or contact Briggs & Stratton if you are unsure of whatsoever procedure or accept additional questions. Notice all Engine Prophylactic Warnings

Step 1: Removing the Carburetor
Pace 2: Disassembling A Float-Blazon Carburetor
Stride 3: Inspecting the Carburetor
Step 4: Inspecting Air-Fuel Mixture Screws
Step 5: Reassembling the Small Engine Carburetor
Step half-dozen: Attaching The Carburetor & Air Cleaner Assembly

Step 1: Removing the Carburetor

• Disconnect the spark plug lead and secure it away from the spark plug. Then, remove the air cleaner assembly.
  

• Turn off the fuel valve at the base of the fuel tank. If your engine does not contain a fuel valve, use a fuel line clench to prevent fuel from draining out of the tank while the carburetor is asunder from the engine.

• Some carburetors incorporate an electrical device at the base of operations of the fuel bowl to command afterfire. Disconnect the device, known equally an anti-afterfire solenoid, by removing the wire connector from the solenoid's receptacle.

• With the carburetor still connected to the governor, unfasten the carburetor mounting bolts. If a connecting pipage joins the carburetor to the engine block, first remove the pipe mounting bolts. So, disconnect the carburetor from the pipe past removing the basics and sliding the carburetor off the studs. Sketch the governor spring positions before disconnecting them to simplify reattachment.

• Then, disconnect the governor springs and remove the carburetor, taking special care not to bend or stretch links, springs or control levers.

Step 2: Disassembling A Float-Type Carburetor

Your carburetor contains a small amount of fuel. Prepare a make clean bowl to take hold of dripping fuel and store small parts. During disassembly, inspect the basin for dirt and debris to determine the condition of your carburetor.

• Remove the fuel basin from the carburetor body. The fuel bowl may be attached with either a commodities or the loftier-speed mixture spiral.

• Push the swivel pin out of the carburetor torso with a small pin or pin punch. Take care to tap just the pivot to avoid dissentious the carburetor body.

• Remove the float associates, inlet needle valve and fuel bowl gasket.

• If your carburetor contains an idle mixture screw, remove it along with the spring.

• Rotate the throttle plate to the airtight position, remove the throttle plate screws and the throttle plate.

• Remove the throttle plate shaft and foam seal.

• Then, remove the choke plate and choke shaft and felt or foam washer in the aforementioned style.
• Use your carburetor repair kit to place replaceable welch plugs. These seals cover openings in the carburetor left over from machining. Insert a sharpened 5/32" pin punch at the border of each plug to be removed and tap cleanly to free the plug.

• Unscrew the main jet from the side of the carburetor pedestal (if equipped). Then, unscrew the emulsion tube; it may be screwed in tight. A carburetor screwdriver is the best tool for the task. It's designed to fit the slot in the caput or the emulsion tube so that y'all won't impairment the threads inside the pedestal of the tube itself as you loosen it.

• Remove the emulsion tube.

Step 3: Inspecting the Carburetor

• Soak metal and plastic carburetor parts in all-purpose parts cleaner for no more than 15 minutes to remove grit. Or, while wearing safety spectacles, spray the parts with carburetor cleaner. And then, wipe abroad solvent and other residue thoroughly using a make clean fabric. Never apply wire or tools considering they can damage or further obstruct plugged openings.
  

• Audit all components and employ boosted carburetor cleaner to loosen stubborn grit and to articulate obstructions.
• Supersede any parts that are damaged or permanently chock-full.

Pace 4: Inspecting Air-Fuel Mixture Screws

• Brass mixture screws control the air-fuel mixture at high speed and at idle. Over tightening tin impairment the tip of the screw and so that proper aligning is no longer possible.

• Remove whatsoever non-metal parts and soak mixture screws in carburetor cleaner for 15 minutes.
• So, inspect them advisedly for clothing. Replace a mixture spiral if the tip is bent or contains a ridge.

Step 5: Reassembling the Minor Engine Carburetor

• Install new welch plugs from your repair kit using a pin punch slightly smaller than the outside diameter of the plug. Tap on the punch with a hammer until the plug is flat (stiff blows with the hammer volition cause the plug to cave in). Then, seal the outside edge of the plug with enamel nail polish.
  

• Assemble the asphyxiate by inserting the return spring inside the foam seal and sliding the leap and seal assembly onto the choke shaft. Plastic asphyxiate plates take a terminate grab at one end of the spring; metal plates have a notch to hold the claw at ane terminate of the spring.
• Insert the choke shaft into the carburetor body and engage the return leap. If the asphyxiate lever uses a detent spring to control the choke plate position, guide the spring into the notched slot on the choke lever. Place the asphyxiate plate on the shaft with the unmarried notch on the edge toward the fuel inlet. Lift the choke shaft and lever upwards slightly and turn counterclockwise until the stop on the lever clears the spring anchor. Push the shaft downward.
• Insert the asphyxiate plate into the choke shaft or attach it with screws so that the dimples face the fuel inlet side of the carburetor. The dimples help hold and align the choke shaft and plate.
• Install the throttle shaft seal with the sealing lip down in the carburetor body until the top of the seal is flush with the top of the carburetor. Turn the shaft until the apartment side is facing out. Attach the throttle plate to the shaft with the screws and so that the numbers on the throttle plate face the idle mixture screw and the dimples face up in.
• Install the inlet needle seat with the groove down, using a bushing driver. Then, install the inlet needle on the float and install the associates in the carburetor body.
• Insert the swivel pin and middle pin. Then, install the rubber gasket on the carburetor and attach the fuel bowl, fiber washer and basin nut.

Step 6: Attaching The Carburetor & Air Cleaner Assembly

• Position the carburetor so the beveled border fits into the fuel intake pipe and attach the carburetor with basics or bolts, as required, leaving these fasteners loose for concluding tightening with a torque wrench. Consult your Briggs & Stratton Authorized Dealer for proper tightening torque.

• Install the air cleaner assembly, making certain that the tabs on the bottom of the air cleaner are engaged.

More Carburetor Repair Resources

How to Clean a Pocket-sized Engine Carburetor

Source: https://www.briggsandstratton.com/eu/en_gb/support/faqs/browse/carburetor-rebuild.html

Posted by: loveshrich.blogspot.com

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