TM 5-4240-501-148PCARBURETIONVacu-Jet and One Piece Flo-JetFig. 69 - Adjust Choke LinkInstall CarburetorInstall carburetor and fuel tank as an assembly. Hookthrottle link into carburetor throttle and governor lever.(For various hook-ups, see Remote Control, Section 4.)Raise carburetor into place, insert a new gasket andfasten with mounting screws.Install governor spring. Install ground wire and remotecontrol where used. Fig. 70.Fig. 70 - Install CarburetorChoke-A-Matic Remote ControlsSee Remote Controls, Section 4, for illustrations byengine model.Carburetor AdjustmentThe initial setting of the needle valve, Fig. 71, is made byturning the needle valve all the way in, then turning out11/2 turns. Final adjustment is made with the enginerunning.Fig. 71 - Carburetor AdjustmentNOTE: All carburetor adjustments should be made withthe air cleaner on engine. Best adjustments made withfuel tank 1/2 full.FINAL ADJUSTMENTPlace governor speed control lever in "FAST" position.Turn needle valve slowly in until engine misses(clockwise - lean mixture) then turn it out slowly pastsmooth operating point until engine runs unevenly (richmixture). Now turn needle valve to the midpoint betweenrich and lean so the engine runs smoothly. Next, adjustidle RPM. Rotate throttle counterclockwise and holdagainst stop. Adjust idle speed adjusting screw to obtain1750 RPM minimum. Release throttle - engine shouldaccelerate without hesitation or sputtering. If enginedoes not accelerate properly, the carburetor should bereadjusted, usually to a slightly richer mixture.ONE PIECE FLO-JET CARBURETORFig. 72 - Small One Piece Flo-Jet CarburetorFig. 73 - Small One Piece Flo-Jet Carburetor20
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business
