Outdoor Power Equipment, Small Engine, Lawn Mower Repairs, Troubleshooting and Safety
Disassembly, Cleaning and Repair of Briggs and Stratton Small Two-Piece Flo-jet Carburetor, Part 2
Continued from Small Two-Piece Flo-jet Carburetor, Part 1.
Briggs Carb Part Numbers 294311, 295607, 295609, 299201, 393753, 393895
used on selected Models 060301, 060302, 060306, 060311, 060311, 060312, 060313, 060316, 060331, 060332, 060336, 060351, 060352, 060353, 060356, 060392, 060396, 060401, 060402, 060403, 060406, 060411, 060412, 060416, 060431, 060432, 060433, 060436, 060451, 060452, 060453, 060456, 061301, 061302, 061303, 061306, 061311, 061312, 061316, 061331, 061332, 061336, 061352, 061353, 061392, 061396, 061401, 061403, 061406, 061411, 061412, 061413, 061416, 061431, 061436, 061452, 061456, 080301, 080302, 080306, 080312, 080313, 080313, 080331, 080332, 080336, 080351, 080352, 080353, 080356, 080392, 080396, 080401, 080402, 080431, 080432, 081301, 081302, 081312, 081316, 081331, 081332, 081336, 081351, 081352, 081353, 081356, 081392, 081396, 081401, 081402, 081431, 081432, 081452, 081453, 082331, 082352, 130412, 130432, 130732, 131431, 131432, 131436, 131437, 131451, 131452, 131492, 132412, 132431, 132432, 132432, 132436, 132437, 132452, 144401, 144402, 144411, 144431, 144432, 144451, 144452, 145401, 145401, 145402, 145431, 145432, 145451, 145452
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- #1. Inlet needle seat and gasket
The inlet needle seat and gasket can be unscrewed and replaced if necessary (#1).
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- #2. Lower body with venturi
The venturi is a separate piece and sits in the lower body (#2).
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- #3. Removable venturi and gasket
Note the small hole in the venturi and gasket (#3). It is part of the path for the air bleed to the emulsion tube.
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- #4. Lower body
The air bleed hole in the venturi leads to a passage, indicated by the blue square in #4, which connects to the emulsion tube. Another hole (green) supplies fuel from the bowl to the emulsion tube. The emulsion tube passes thruogh the hole indicated by yellow.
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- #5. Main air bleed
The main air bleed path continues from the venturi up into the upper body and out to the atmosphere as shown by the wire in (#5).
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- #6. Bowl vent path
The bowl vent originates at the air intake end of the carb and continues up into the upper body (#6).
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- #7. Bowl vent path - older version
On older version of the Small Two-piece Flo-jet carb the bowl vent originated nearer the intake elbow (#7).
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- #8. Upper body bowl vent
A ball plug seals one end of the hole where a passage was drilled to complete the bowl vent path (#8). Air finally reaches the bowl through holes in the bowl gasket.
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- #9. Idle speed adjustment screw
The idle speed adjustment screw (throttle crack screw or throttle stop screw) determines how far the throttle is allowed to close thereby setting idle speed (#9). To remove the throttle shaft, drive or press out the roll pin as seen in the photo. The throttle plate is installed with the bumps on the same side as the throttle plate screw head.
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- #10. Replaceable throttle shaft bushing
This carb has replaceable throttle shaft bushings (#10). To remove, use a screw extractor or tap a thread into the bushing, thread in a screw and pull out the bushing.
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- #11. Large welch plug at intake elbow
There is a large welch plug at the intake elbow of the carb which must be removed to service the choke plate and shaft (#11).
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- #12. Pry out welch plug from within
Remove the welch plug by prying with a suitable tool from within the air horn (#12). When installing a new plug use sealant around the perimeter and stake or swage the casting over the plug in a number of places.
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- #13. Spread choke shaft to free plate
To remove the choke plate from the choke shaft, pry up the top half of the shaft with thin-edged tool and pull out the plate (#13).
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- #14. Choke shaft, plate and detent
The choke parts laid out in order (#14).
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- #15. Check flatness of upper body
Check the flatness of the upper body and straighten the corners as necessary (#15).
Go back to Small Two-Piece Flo-jet Carburetor, Part 1.