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This guide shows how to rebuild a primer style carburetor on a Briggs and Stratton quantum engine. The guide is applicable to many different models and brands of mowers.
This engine can be found on push mowers, log splitters, tillers, leaf vacs, leaf blowers, tractors, and more. It is applicable to 4.5-8 horsepower engines. A carburetor rebuild is required after fuel is left in a mower over a long period of time or water has gotten into the fuel.
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The air filter and its cover are located to the right of the yellow warning label under the throttle cable.
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Remove the single screw attaching the cover and filter using a 5/16'' socket.
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Pull straight outward until the filter assembly is detached.
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The throttle cable will be located above the air filter assembly.
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Use a flathead screwdriver to remove the throttle cable.
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Remove the backplate of the air filter assembly to access the carburetor.
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Using a 5/16" socket, remove the three screws inside of the assembly.
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Remove the fuel line spring clamp with pliers.
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Remove the fuel line from the carburetor by pulling directly outward.
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Drain the fuel line into a container and dispose of it properly.
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To remove the carburetor, use a 3/8" socket with an extension and ratchet to remove the two screws attached to the engine block.
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Remove the carburetor bowl screw with a 1/2" socket and ratchet.
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Spray the interior of the carburetor with carb cleaner.
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Remove the float pin.
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Spray out the three major spots in the following order: the main adjustment hole, the inlet needle hole, and the main jet.
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If using a needle to clear passages, spray the passages with carb cleaner after clearing.
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After all parts are clean, lay them out to prepare for reassembly.
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To reassemble your device, follow these instructions in reverse order.
To reassemble your device, follow these instructions in reverse order.
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