Snapper Complete Guide to Spark Plug Replacement for Lawnmowers

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Pre-Cleaner Service

NOTE: Replace a worn or damaged pre-cleaner.

1.Figure 28. Wash the pre-cleaner in liquid detergent and water.

2.Squeeze the pre-cleaner dry and saturate with engine oil. Remove all excess oil by squeezing the pre-cleaner in an absorbent cloth.

Air Filter Service

NOTE: Replace a worn or damaged air filter.

Pre-Cleaner

1.

2.

Air Filter

1.

2.

1.Figure 28. If stamped “Washable,” the filter can be washed with warm water and mild soap.

2.Rinse with tap water with the screen side UP allowing dirt and debris to filter out.

3.Allow the filter to dry overnight before reinstalling.

Figure 28. Air Filter Service

REPLACE SPARK PLUG

Service Interval: Yearly

Replacement Spark Plug: 71/500/691043

Spark Plug Gap: .030” (.76mm)

1. Stop the engine and allow it to cool.

2. Clean the area around the spark plug.

3. Remove the spark plug.

4.Check the spark plug gap. It should be .030” (see Figure 29).

5. Reinstall the plug into the cylinder head. Torque the plug to 180 in. lbs (20 N.m.).

Figure 29. Spark Plug Gapping

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Contents Mfg. No Description OPERATOR’S ManualPage Table of Contents General Operation Safety RulesIgnition System Safe Handling of Gasoline Service & MaintenanceSafety & Operation Decals North American Identification NumbersCE Models OnlyRead The Operator’s Manual PRE-OPERATIONControl Functions OperationGround Speed Levers Parking Brake Throttle ControlGeneral Operating Safety Fuel Recommendations Checks Before StartingStopping the Rider & Engine Emergency StoppingStarting the Engine MowingSmooth Travel Driving PracticeForward Travel Practice Reverse Travel PracticePractice Turning In Place Practice Turning Around a CornerExecuting Turns Executing an End-Of-Row Zero TurnInstalling the Mower Deck Mower Deck Removal InstallationRemoving the Mower Deck Maintenance Schedule MaintenanceRider MAINTENANCE, All Models 18.5HP Briggs & StrattonClean Debris from Engine Cooling Areas and AIR Filter Clean Debris from Rider and Engine CompartmentCheck Tire Pressure Grease LubricationOil Blade Removal Clean Deck Check / Replace Mower BladesCheck Rider Safety System Cleaning the Battery and CablesOperational Safety Checks Adjust PTO Clutch Window Adjustment Nut Feeler Gauge Check / Adjust PTO ClutchChange Engine OIL Check Engine OIL LevelChange Engine OIL & Filter Air Filter Removal & Installation AIR Filter & PRE-CLEANERAir Filter Service Pre-Cleaner Pre-Cleaner ServiceReplace Spark Plug Ground Speed Control Lever Adjustment Service & AdjustmentsSpeed Balancing Adjustment PTO Clutch Adjustment Cutting Height AdjustmentBrake Adjustment Battery ChargingSide to Side Leveling Mower Deck Leveling AdjustmentsMower Drive Belt Replacement Mower Belt ReplacementFront To Back Leveling Storage StorageTroubleshooting the Rider TroubleshootingTroubleshooting the Mower Engine DimensionsChassis TransmissionPage Page RO D U C T S