Install Carburetor

TM 5-4240-501-148P CARBURETION Vacu-Jet and One Piece Flo-Jet Fig. 69 - Adjust Choke Link Install Carburetor Install carburetor and fuel tank as an assembly. Hook throttle link into carburetor throttle and governor lever. (For various hook-ups, see Remote Control, Section 4.) Raise carburetor into place, insert a new gasket and fasten with mounting screws. Install governor spring. Install ground wire and remote control where used. Fig. 70. Fig. 70 - Install Carburetor Choke-A-Matic Remote Controls See Remote Controls, Section 4, for illustrations by engine model. Carburetor Adjustment The initial setting of the needle valve, Fig. 71, is made by turning the needle valve all the way in, then turning out 11/2 turns. Final adjustment is made with the engine running. Fig. 71 - Carburetor Adjustment NOTE: All carburetor adjustments should be made with the air cleaner on engine. Best adjustments made with fuel tank 1/2 full. FINAL ADJUSTMENT Place governor speed control lever in "FAST" position. Turn needle valve slowly in until engine misses (clockwise - lean mixture) then turn it out slowly past smooth operating point until engine runs unevenly (rich mixture). Now turn needle valve to the midpoint between rich and lean so the engine runs smoothly. Next, adjust idle RPM. Rotate throttle counterclockwise and hold against stop. Adjust idle speed adjusting screw to obtain 1750 RPM minimum. Release throttle - engine should accelerate without hesitation or sputtering. If engine does not accelerate properly, the carburetor should be readjusted, usually to a slightly richer mixture. ONE PIECE FLO-JET CARBURETOR Fig. 72 - Small One Piece Flo-Jet Carburetor Fig. 73 - Small One Piece Flo-Jet Carburetor 20