Carburetor Assembly, Zinc and "Minion"

TM 5-4240-501-148P CARBURETION Pulsa-Jet, Vacu-Jet Fig. 29 - Mixture Needle NOTE: On Vacu-Jet carburetors there is a check ball in the fuel pickup tube. To function properly, the screen must be clean and the check ball free. Replace pipe if Screen 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 and choke shaft. Choke shaft lever should be as shown in Fig. 30, Illus. I, II, III. Fig. 30 - Choke Lever On zinc carburetors, install needle valve seat being sure not to cause burrs in slot. Then install needle valve assembly, Fig. 31 or Fig. 32. NOTE: Some zinc carburetors use Minlon valve assembly, Fig. 32. Fig. 31 - Needle Valve Assembly, Zinc Body To install Minion needle valve assembly, place "O" ring on shoulder of needle seat. Then turn needle in until large seal washer just touches needle seat, Fig. 32. Fig. 32 - Needle Valve Assembly, Minion Body Install needle valve as an assembly being sure flat on valve seat lines up with flat in carburetor body, Fig. 33. Oil fill tube, part no. 280131 will help firmly seat valve assembly. Fig. - 33 - Assembling Valve in Minion Body Place "O" ring in groove in throttle bore. Early "O" rings had a square cross section. Current "O" rings have a round cross section. Fig. 34. Fig. 34 - "O" Ring 11