TM 5-4240-501-148PCARBURETIONPulsa-Jet, Vacu-JetFig. 29 - Mixture NeedleNOTE: On Vacu-Jet carburetors there is a check ball inthe fuel pickup tube. To function properly, the screenmust be clean and the check ball free. Replace pipe ifScreen is clogged or the check ball is not free to move.Carburetor Assembly, Zinc and "Minion"When assembling carburetor, use new "O" rings,gaskets and/or diaphragms. Install choke plate andchoke shaft. Choke shaft lever should be as shown inFig. 30, Illus. I, II, III.Fig. 30 - Choke LeverOn zinc carburetors, install needle valve seat being surenot to cause burrs in slot. Then install needle valveassembly, Fig. 31 or Fig. 32.NOTE: Some zinc carburetors use Minlon valveassembly, Fig. 32.Fig. 31 - Needle Valve Assembly, Zinc BodyTo install Minion needle valve assembly, place "O" ringon shoulder of needle seat. Then turn needle in untillarge seal washer just touches needle seat, Fig. 32.Fig. 32 - Needle Valve Assembly, Minion BodyInstall needle valve as an assembly being sure flat onvalve seat lines up with flat in carburetor body, Fig. 33.Oil fill tube, part no. 280131 will help firmly seat valveassembly.Fig. - 33 - Assembling Valve in Minion BodyPlace "O" ring in groove in throttle bore. Early "O" ringshad a square cross section. Current "O" rings have around cross section. Fig. 34.Fig. 34 - "O" Ring11
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