Craftsman 917.25651 To Adjust Carburetor See Fig, Preliminary Setting, Final Setting

Page 25

SERVICE A ADJUSTMENTS

TO ADJUST CARBURETOR (See Fig. 28)

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 fuel/air mixture,.

IMPORTANT: DAMAGE TO THE NEEDLE VALVE AND THE SEAT IN CARBURETOR MAY RESULT IF 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 valve 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.

oWhile 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 positionso Release throttle lever..

ACCELERATION TEST -

°Move throttle control lever from slow (,_) to fast (,@) positiono if engine hesitates or dies, turn idle mixture

valve out (counterclockwise) 1/8 turn. 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 WiTH THE ENGINE

GOVERNOR, WHICH IS FACTORY SET FOR PROPER

ENGINE SPEED. OVERSPEEDINGTHE ENGINE ABOVE

THE FACTORY HIGH SPEED SETTING CAN BE

DANGEROUS. IF YOU THiNKTHE ENGINE-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, 28

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Contents Assembly o Operation Engine Exhaust from this product con Safe Operation Practices for Ride-On MowersTains chemicals known to the State of Califor Nia to cause cancer, birth defects, or otherProduct Specifications Maintenance AgreementLimited 90 DAY Warranty on Battery ModelIndex Engine Maintenance Accesso Iesa Attach EntsPerformance Contents of Hardware Pack To Remove Tractor from Carton Tools Required for AssemblyBefore Rolling Tractor OFF Skid Unpack CartonConnect Battery See Figs AssemblyInstall Seat See Fig Check Deck Levelness Check Tire PressureCheck for Proper Position of ALL Belts Check Brake SystemLock OperationKnowyourtractor OPERATmOTo Adjust Mower Cutting Height See Fig HOW to USE Your TractorOperatio To SET Parking Brake See FigTo Operate on Hills OperathonTo Transport ADD GasolineTo Start Engine See Fig OperationMaintenance Schedule AS YOU Complete Lubrication ChartCustomer Respons General RecommendationsBrake Operation TractorTires Blade CareCustom Respons BatteryEngine BeltsEsponsu Lines Clean AIR Screen See FigAIR Filter See Fig Engine Cooling Fins See FigEspo CleaningMuffler Spark PlugsTo Install Mower See Fig Service and Adjus EntsTo Remove Mower See Fig Side To Level Mower HousingTo Adjust Brake See Fig Servmcea AdjustmentsTo Replace Mower Blade Drive Belt See Fig To Replace Motion Drive BeltFront Wheel TOE-IN/CAMBER To Adjust Steering Wheel AlignmentTo Remove Wheel for Repairs To Remove CABLES, Reverse OrderTo Adjust Throttle Control Cable Ervice a AdjustmentsTo Remove Hood and Grill Assembly EnginePreliminary Setting To Adjust Carburetor See FigFinal Setting Acceleration TestOther TractorFuel sYSTEM Engine OILProblem Cause Correction =ROU LESHOOTmNG POmNrSTractor -- Model Number SchematicElectrical Tractor - Model Number31\ Repair Parts Chassis and Enclosures Tractor --MODEL NumberNO. no Repair Parts11.-I Drive112--Tj 42 19131312 Washer 13/32X 13/16 X t2 Ga Belt RetainerNyl 503 Steering Assembly Repaur Parts Tractor - Model Npjmber Seat AssemblyInches Wheels & Tires DecalsInsert Hood 8113 Engine4033 29\ Repair Parts Lift Tractor --MODEL Number 917,256510161718 Lift L.,H Tractor - Model Number 917,256510Mower TRACTOR-- Model NumberUNC Description5551 43 = Dana Transaxle Model NumberShaft Briggs & Stratton Engine Model Number 28N707, Type Number Valve Overhaul KIT 127 137130 147 634B 137 164 123Carburetor Gasket SET Briggs & Stratton Engine Model544 877 601 209 783 311803 32A 399265284A 94073 Screw Hex Head 729A 225170 ERVmCE Notes Sight and Hold this Level with SKY Line or Tree Sighting JideModel Number Engine Model NO. 28N707, Type no For Repair SERVICE, Call this Toll Free NumberPart Description
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