Small Engine Carburetor Two-piece Flo-Jet Service
Small, medium, and large two-piece Flo-Jets are the only up-draft carburetors in the Briggs line. Figure 4-4A shows the parts layout common to all three models.
Needle & seat Extract the elastomer seat by threading a self-tapping screw into the fuel orifice (Fig. 4-11). Press in a replacement seat—PN 230996 for gravity feed, PN 231019 for applications with a fuel pump—flush with the casting. Viton-tipped needles can be reused, if not obviously worn.
Float setting When inverted and assembled without a bowl-cover gasket, the float should rest level with the casting (Fig. 4-12). Adjust float height by bending the tang with long-nosed pliers. Figure 4-13 illustrates the proper orientation of the needle clip for this and other carburetors that employ the device.
Casting distortion Over tightening the hold-down screws distorts the bowl-cover casting. Assemble without a gasket, and check with a 0.002-in. feeler gauge (Fig. 4-14). If the blade enters, remove the cover and straighten the “ears” with light hammer taps.
Throttle shaft/bearing replacement Follow this procedure:
1. Using a 1/8-in. punch, drive out the roll pin that secures the throttle lever to its shaft.
2. Scribe marks on the throttle blade and carburetor body as assembly references.
3. Remove the two small screws that secure the throttle butterfly to the shaft.
4. Remove the butterfly and shaft.
5. Extract the shaft bushings with a 1/4-in. tap.
6. Press in new bushings to original depth.
7. Install a new throttle shaft and throttle butterfly with scribe marks indexed. Coat the butterfly screw threads with Loc-tite. Start the screws, but do not tighten.
8. Close the butterfly to center it in the carburetor bore and tighten the screws. Verify that the butterfly swings through its full arc without interference. Complete the assembly.
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