TM 5-4240-501-148PCARBURETIONPulsa-Jet, Vacu-Jet (Vertical Crankshaft)4.To check adjustment move engine control fromSLOW to FAST speed. Engine should acceleratesmoothly. If engine tends to stall or die out, increaseidle speed or re-adjust carburetor, usually to aslightly richer mixture.NOTE: Flooding can occur if the engine is tipped atan angle for a prolonged period of time, if the engineis cranked repeatedly when the spark plug wire isdisconnected or if carburetor mixture is adjusted toorich.In case of flooding, move the governor control to the"Stop" position and pull the starter rope at least sixtimes. (Crank electric starter models for at least 5seconds.)When the control is placed in the "Stop" position thegovernor spring holds the throttle in a closed (idle)position. Cranking the engine with a closed throttlecreates a higher vacuum which opens the chokerapidly, permitting the engine to clear itself of excessfuel.Then move the control to "Fast" position and startengine. If engine continues to flood, lean carburetorneedle valve -1/8 to 1/4 turn clockwise or see page5.If the engine on a mower with a high-inertia disc typecutter blade becomes hard starting when the engine iswarm, a leaner carburetor mixture may be required.A heavy, high-inertia disc type cutter blade rotates for alonger period of time, after the governor control is placedin the STOP position. During this "coasting" period, theengine continues to induct the fuel-air mixture, evenwhen the choke is open. If the carburetor mixture is toorich, the warm engine may flood and become hardstarting. If the original carburetor adjustment has notbeen changed, turn the needle valve clockwise (leaner)approximately 1/8 turn. If the original carburetoradjustment has been changed, follow previousadjustment procedure paragraph No. 2 A, B and C, thenadjust 1/8 turn leaner.Cleaning Fuel SystemGummy or dirty fuel tanks, lines and carburetors shouldbe cleaned in a carburetor cleaner, such as Bendix. Donot soak diaphragms or nylon parts in cleaner.MODEL SERIES 82000, 92000, 94000, 110900 and111900 onlyModel Series 82500, 92500 and 94500 have a VacuJetcarburetor. Model Series 82900, 92900, 94900, 110900and 111900 have a Pulsa-Jet carburetor.Remove carburetor and fuel tank assembly mountingbolts, Fig. 18.Fig. 18 - Removing Mounting BoltsSlip carburetor and fuel tank assembly off end of fuelintake tube and turn assembly to free throttle link fromthrottle lever. This will leave governor link and governorspring connected to the governor blade and control lever,Fig. 19.Fig. 19 - Remove Carburetor and Tank AssemblyMODEL SERIES 94000Disconnect governor spring from control lever. Slidecarburetor and fuel tank assembly off end of fuel intaketube and turn assembly to disconnect governor link frombell crank lever. This will leave governor spring and bellcrank assembly on carburetor and fuel tank assembly,Fig. 20.8
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