Craftsman 917.270831 owner manual To Adjust Carburetor, Preliminary S EI-IING, Acceleration Test

Page 26

Choke Closed _

4

I

Choke Lever

TO ADJUST CARBURETOR

The carburetor has been preset at the factory and adjustment should not be necessary. However, minor adjustment 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 the mixture screw in (clockwise) decreases the supply of fuel to the engine giving a leaner fuel/air mixture. Turning the mixture screw out (countemlockwise) increases the supply

of fuel to the engine giving a richer fuel/ air mixture.

IMPORTANT: Damage to the needles and the seats in carburetor may reslut if screw is turned in too tight.

PRELIMINARY S EI-I'ING-

•Be sure you have a clean air filter, and the throttle control cable and choke are adjusted properly (see above).

•With engine off turn idle mixture screw in (clockwise) closing it finger tight and

then turn out (countemlockwise) 1-1/4 to 1-1/2 turns.

FINAL SETTING -

•Start engine and allow to warm for five minutes. Make final adjustments with engine running and s_ift/motion

control lever in neutral (N) position.

•With throttle control lever in slow position, hold throttle lever against idle

speed screw and adjust idle speed screw to obtain 1200 to 1400 RPM.

•While still holding throttle lever against idle speed screw, turn idle mixture screw in (clockwise) until engine begins to die and then turn out

(counterclockwise) until engine runs rough. Turn screw to a point midway between those two positions.

•Continue to hold throttle lever against idle speed screw and adjust idle speed screw to obtain 900 to 1200 RPM. Release throttle lever.

ACCELERATION TEST -

•Move throttle control lever from slow to fast position. If engine hesitates or dies, turn idle mixture screw out

(counterclockwise) 1/8 turn. Repeat test and continue to adjust, if neces-

sary, until engine accelerates 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, overspeeding the engine above the factory high speed setting can be dangerous, if you think

the engine-govemed high speed needs adjusting, contact your nearest AUTHO- RIZED service center/department, which

has proper equipment and experience to make any necessary adjustments.

ldle Speed

i: crMix_reu

few Throttle

Lever

Idle Speed

Screw

Throttle Lever Idle Mixture

Screw

26

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Contents
RRIIFTSMIIN General OPERATleN Children ServiceSlope Operation Do notChine allgrass can hide obstacles Maintenanceagreement Customer ResponsibilitiesParts Bag contents shown full size Teering To Remove Tractor from Carton HOW to SET UP Your Tractor Check BatteryTools Required for Assembly Before Rolling Tractor OFF Skid Attach Steering WheelTo Drive Tractor OFF Skid Install Mulcher PlateInstall Seat To Convert to Bagging or Discharging Attachment Reverse Neutral High Free WheelKnow Your Tractor HOW to USE Your Tractor StoppingTo Transport To Adjust Gauge WheelsTo Operate on Hills To Operate MowerTo Start Engine Before Starting the Enigne Check Engine OIL LevelADD Gasoline Mowing Tips Mulching Mowing TipsBefore Each USE Lubrication ChartGeneral Recommendations AtesOperator Presence System Brake OperationTires Blade CareEngine BeltsTransaxle Cooling Muffler Spark PlugsTractor To Install MowerTo Level Mower Housing To Remove Mower To Replace Mower Blade Drive Belt SIDE-TO-SIDE Adjustment FRONT-TO-BACK Adjustment Belt RemovalBelt Installation To Adjust BrakeNeutral Adjustment To Replace Motion Drive BeltTo Adjust Steering Wheel Alignment Front Wheel TOE-IN/CAMBEREngine To Replace Headlight BulbAcceleration Test To Adjust CarburetorPreliminary S EI-IING Fuelsystem BatteryTractor Engine OILProblem Cause CorrectionTroubleshootingchart Problem CauseTroubleshooting Chart Problem Cause Connected to SchematicTractor - Model Number Will Become Their BrightestTractor Model Number Electrical Tractor Model Number KEY Part DescriptionTractor Model Number Chassis and Enclosures Tractor Model Number Chassis and Enclosures IY Part NO. noTractor Model Number Ground Drive KEY Part DescripionSteering NO. NO. DES SteeringTRACTOR- Model Number Tractor Model Number Engine Optional EquipmentTractor Mode L NUM BER Engine KEY Part NO. noSeat Assembly Tractor --MODEL Number13EY Part Wheels and TiresTractor Model NUM BER KL=Y Part DescriptionTractor Model Number List Assembly 171e20Part NO. no Description Mower Deck TRACTOR- Modelnumber Mower Deck Part Description157 MST REF PartDescription NO. no 15 .7 to INSTALL. Seerepair Instructionmanual 8i IolabelkitPump Repair KIT Carburetor KIT@ 20@ Gasket SETKEY Part NO. no KEY Part Description337 802592 Plug-Spark 822 693497 Sighting Guide Only Ride UP and Down HillNot Across Hill Sears
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