Install Carburetor

TM 5-4240-501-148P CARBURETION Pulsa-Jet Choke-A-Matic Remote Controls See Section 4 for illustrations by engine model. Install Carburetor Except Model 100900 and 130900 Install carburetor and tank as one assembly on engine. Hook throttle link into carburetor throttle and governor lever (for various illustrations, see Section 4). Raise carburetor into place, insert a new gasket and fasten with mounting screws. Install governor spring. Fig. 56. Install ground wire and remote control where used. Fig. 56 - Installing Ground Wire Install Carburetor Model 100900, 130900, and 131900 Assemble carburetor to tank. Hold throttle link to throttle. Fig. 57. Slip carburetor over notch in cylinder shield and around intake tube. Oil the seal in carburetor body to prevent damage, when installing. Mount tank to cylinder. Hook up ground wire and governor spring. Fig. 57 - Install Carburetor - Model 100900 and 130900 Fig. 57A - Install Carburetor - Model 131900 Carburetor Adjustment Turn needle valve clockwise until it just closes. CAUTION: Valve may be damaged by turning it in too far. Now open needle valve 11/2 turns counterclockwise, Fig. 58. This initial adjustment will permit the engine to be started and warmed up prior to final adjustment. NOTE: All carburetor adjustments must 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 in until engine misses (clockwise - lean mixture) then turn it out 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. Release throttle - engine should accelerate without hesitation or sputtering. If engine does not accelerate properly, the carburetor should be re-adjusted, usually to a slightly richer mixture. Fig. 58 - Setting Needle Valve NOTE: When starting a Pulsa-Jet engine for the first time, fill fuel tank completely full. This eliminates priming the fuel pump. thus insuring a quick start. 17