Husqvarna 968999239 Ignition system, Fitting the wrong spark plug type can damage the engine

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MAINTENANCE

Ignition system

The engine is equipped with an electronic ignition system. Only the spark plug requires maintenance.

For recommended spark plug, see “Technical data”.

IMPORTANT INFORMATION

Fitting the wrong spark plug type can damage the engine.

1. Remove the ignition cable shoe and clean around the spark plug.

2.Remove the spark plug with a 13/16” (21 mm) spark plug socket wrench.

3.Check the spark plug. Replace the spark plug if the electrodes are burned or if the insulation is cracked or damaged. Clean the spark plug with a steel brush if it is to be reused.

4.Measure the electrode gap with a gapping tool. The gap should be 0.7-0.8 mm/0.028-0.031”. Adjust as necessary by bending the side

electrode.

5. Reinsert the spark plug, turning by hand to avoid damaging the threads.

IMPORTANT INFORMATION

Inadequately tightened spark plugs can cause overheating and damage the engine. Tightening the spark plug too much can damage the threads in the cylinder head.

6.After the spark plug is seated, tighten it using a spark plug wrench so that the washer is compressed. A used spark plug should be turned 1/8-1/4 of a turn from the seated position. A new spark plug should be turned 1/2 a turn from the seated position.

7.Replace the ignition cable shoe.

8011-027

8011-054

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Contents Manual no REV 03/08/04 Operator’s Manual Model 968999239Husqvarna All Rights Reserved Printed Beatrice, Nebraska Table of Contents Introduction Decals and machine-bound instructions Symbols and DecalsDecal Location of decals Translation of instructionsDecal Important information General use Safety InstructionsSafety Instructions Preparations Operating Children Movement/TransportStorage Fuel system Maintenance Personal equipment Protective EquipmentEquipment set-up SET-UPHair PIN Engine Main components and operating controls ControlsPresentation 12 11 EngineThrottle Choke control StarterStarter handle Fuel valveOil drainage Spark plugMuffler Oil dipstickDead man’s grip bar Fuel tankFueling Centrifugal clutchNever operate a machine with a defective brake On/Off Engine switch on the panelAdjustment bar for the handle BrakeStarting the engine OperationStarter handle Engine switch on the handleDead man’s grip bar Brake Engine switchNormal shutdown Shutdown in emergency situationsBefore you start Using your stump grinder 8011-202chg Transport Shut off the machine when you are doneOperating on hills Maintenance schedule MaintenanceCleaning the cyclone filter Replacing the air filter Idle adjustment Cleaning the sludge reservoirFitting the wrong spark plug type can damage the engine Ignition systemAdjusting the drive belt Disassembling and reassembling the blade, pockets and teeth Removing and refitting the wheels Two minute rule Adjusting the brakeCleaning and washing Blade shaft bearings LubricationChecking the engine’s oil level Engine oilThrottle cable Right wheelSymptom Cause Action TroubleshootingProblem Possible solutions Winter storage ServiceStorage Model Technical DataWiring Diagram Delivery service Service JournalService Journal