TM 5-4240-501-148PCARBURETIONPulsa-JetChoke-A-Matic Remote ControlsSee Section 4 for illustrations by engine model.Install CarburetorExcept Model 100900 and 130900Install carburetor and tank as one assembly on engine.Hook throttle link into carburetor throttle and governorlever (for various illustrations, see Section 4). Raisecarburetor into place, insert a new gasket and fasten withmounting screws. Install governor spring. Fig. 56. Installground wire and remote control where used.Fig. 56 - Installing Ground WireInstall Carburetor Model 100900, 130900, and 131900Assemble carburetor to tank. Hold throttle link to throttle.Fig. 57. Slip carburetor over notch in cylinder shield andaround intake tube. Oil the seal in carburetor body toprevent damage, when installing. Mount tank to cylinder.Hook up ground wire and governor spring.Fig. 57 - Install Carburetor - Model 100900 and130900Fig. 57A - Install Carburetor - Model 131900Carburetor AdjustmentTurn needle valve clockwise until it just closes.CAUTION: Valve may be damaged by turning it in toofar.Now open needle valve 11/2 turns counterclockwise, Fig.58. This initial adjustment will permit the engine to bestarted and warmed up prior to final adjustment.NOTE: All carburetor adjustments must 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 in until engine misses (clockwise -lean mixture) then turn it out past smooth operating pointuntil engine runs unevenly (rich mixture). Now turnneedle valve to the midpoint between rich and lean sothe engine runs smoothly. Next, adjust idle RPM. Rotatethrottle counterclockwise and hold against stop. Adjustidle speed adjusting screw to obtain 1750 RPM. Releasethrottle - engine should accelerate without hesitation orsputtering. If engine does not accelerate properly, thecarburetor should be re-adjusted, usually to a slightlyricher mixture.Fig. 58 - Setting Needle ValveNOTE: When starting a Pulsa-Jet engine for the firsttime, fill fuel tank completely full. This eliminates primingthe fuel pump. thus insuring a quick start.17
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