Sears 917.25953 Service a Adjustments, To Adjust Carburetor See Fig, Preliminary Setting

Page 26

SERVICE A ADJUSTMENTS

TO ADJUST CARBURETOR (See Fig. 34)

The carburetor has been preset at the factory and adjust- ment should not be necessary. However, minor adjust- ment may be required to compensate for differences in fuel, temperature, altitude or load. If the carburetor does need adjustment, proceed as follows:

In general, turning idle mixture valve in (clockwise) de- creases the supply of fuel to the engine giving a leaner fuel/ air mixture, Turning the idle mixture valve out (counter-

clockwise) increases the supply of fuel to the engine giving a richer fue!/air mixture.

IMPORTANT: DAMAGE TO THE NEEDLE VALVE AND THE SEAT IN CARBURETOR MAY RESULT tF SCREW IS TURNED IN TOO TIGHT.,

PRELIMINARY SETTING -

•Air cleaner assembly must be assembled to the carbu- retor when making carburetor adjustments

°Be sure the throttle control cable is adjusted properly (see above)

•With engine off turn idle mixture vatve in (clockwise) closing it finger tight and then turn out (counterclock- wise) 1 full turn,.

FINAL SETTING

°Start engine and allow to warm for five minutes. Make final adjustments with engine running and shift/motion control lever in neutral (N) position,

. Move throttle control lever to slow (._) position, With finger, rotate and hold throttle lever against idle speed screw. Turn idle speed screw to attain 1750 RPM

•While still holding throttle lever against idle speed screw, turn idte mixture valve in (clockwise) until en- gine begins to die and then turn out (counterclockwise) until engine runs rough, Turn valve to a point midway between those two positions. Release throttle lever,,

ACCELERATION TEST

oMove throttle control lever from slow (,,J_) to fast (,_) position° If engine hesitates or dies, turn idle mixture

vatveout (counterclockwise) 1/8turn. Repeat test and continue to adjust, if necessary, until engine acceler- ates smoothly.

High speed stop is factory adjusted, Do not adjust - damage may result.

IMPORTANT: NEVER TAMPER WtTH THE ENGINE GOVERNOR, WHICH IS FACTORY SET FOR PROPER

ENGINE SPEED° OVERSPEEDING THE ENGINE ABOVE

THE FACTORY HIGH SPEED SETTING CAN BE

DANGEROUS IFYOUTHINKTHEENGINE-GOVERNED

HIGH SPEED NEEDS ADJUSTING, CONTACT YOUR

NEAREST AUTHORIZED SERVICE CENTER/

DEPARTMENT, WHICH HAS PROPER EQUIPMENT AND

EXPERIENCE TO MAKE ANY NECESSARY ADJUSTMENTS.

THROTTLE

IDLE SPEED

LEVER_,____SCREW

IDLE MIXTURE

VALVE

FIG. 34

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Contents IIIII/1//1/1//I/I/11 Safety Rules Limited TWO Year Warranty on Craftsman Riding Equipment Product SpecificationsMaintenance Agreement Limited 90 DAY Warranty on BatteryINDEX Accessories AN Attach Ents PerformanceContents of Hardware Pack To Remove Tractor from Carton Tools Required for AssemblyHOW to SET UP Your Tractor Before Rolling Tractor OFF SkidCheck Brake System Check Tire PressureCheck Deck Levelness To Convert to Bagging or 7CHECKLISTInstall Mulcher Plate See Figs FIGoOperation LockOperatro Know Your TractorHOW to USE Your Tractor To Move Forward and Backward SeeTo Operate on Hills OperatuoBefore Starting the Engine Check Engine OIL Level See FigHydrostatic Transmission Warm UP ADD GasolinePurge Transmission Important should Your Transmission RequireMowing Tips Mulching Mowing TipsGeneral Recommendations Lubrication ChartRegularservice ReptaceSparkPlugBrake Operation Customer ResponTractor Blade Removal See FigBelts BatteryTo Clean Battery and Terminals Transaxle CoolingTo Service Cartridge Clean AIR Screen See FigTo Service PRE-CLEANER AIR Filter See FigSpark Plugs CleaningOusto E ESPONS! Lities ViufflerDepress clutch/brake pedal fully and set parking brake To Install Mower See FigTo Remove Mower See Fig SERVmCE and Adjustments To Level Mower HousingSee Fig Service ANAdjustments To Replace Motion Drive Belt See FigTransmission Removaijreplacement Service AN AdjustmentsTo Adjust Motion Control Lever See Fig To Start Engine with a Weak Battery See FigTo Replace Headlight Bulb To Adjust Throttle Control Cable See FigTo Remove Hood and Grill Assembly INTERL.OCKS and RelaysPreliminary Setting Service a AdjustmentsTo Adjust Carburetor See Fig Final SettingOther StorageEngine TRO Leshooting POmNTS Cause CorrectionTroubleshootung Pounts Causecorrection
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