Polaris 2003 MSX Engine Runs Irregularly, Stalls or Misfires, Possible Weak Spark Cause Solution

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		ENGINE TROUBLESHOOTING
	Engine Runs Irregularly, Stalls or Misfires

	Possible Weak Spark Cause	Solution

	Fouled or defective spark plugs	Inspect, clean and/or replace spark plugs

	Worn or defective spark plug wires	See your Polaris dealer

	Incorrect spark plug gap or heat range	Set gap to specs or replace plugs

	Loose spark plug connections	Check all connections and tighten

	Water present in fuel	Replace with new fuel

	Clogged exhaust pipe screen fitting	Clean screen fitting

	Water in exhaust pipe	Drain exhaust

	Low battery voltage	Recharge battery to 12.5 VDC

	Possible Lean Fuel Mixture Cause	Solution
	Possible Lean Fuel Mixture Cause	Solution

	Low or contaminated fuel	Add or change fuel, clean the fuel system

	Low octane fuel	Replace with recommended fuel

	Clogged fuel filter	See your Polaris dealer

	Possible Rich Fuel Mixture Cause	Solution
	Possible Rich Fuel Mixture Cause	Solution

	Fuel is very high octane	Replace with lower octane recommended fuel

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Contents MSX Page We’ve created a web site, just for YOU Page Welcome Polaris Recreational VehiclesPolaris Professional Series Workmobilest Table of Contents Do Your Part Your ResponsibilitiesAge Restrictions Maintenance RequirementsIdentification Numbers Signal Words and Symbols SafetySafety Decals Safety To Avoid Collisions Righting Capsized Boat Located on the engine water manifold Informational DecalsOperator Guidelines Operator SafetySafety Suit/Shoes/Gloves Safe Riding GearPersonal Floatation Device Eye ProtectionOverloading the Watercraft Fire SafetyProtective Apparel Weather and DarknessObstacles and Shallow Water Service and Maintenance Turning and AcceleratingPre-Operation Check Lifting the Watercraft Jet Pump Water Intake SafetyElectrical Shock Hazard Safe Riding PositionOperator Awareness Operator FitnessBoating Under the Influence To avoid hypothermia Vehicle ModificationsOperator Fatigue and Dehydration HypothermiaExhaust Outlet Reverse Gate Features and Controls911 Reverse Operation Handle Features and Controls Engine Components under seat Engine Components Accessible Functions New Generation Instrument NGIPrimary Functions Function Overview Instrument Operation Display ModeCheck Engine Display WarningsRPM Limiter Accessories Standard EquipmentOptional Equipment Emissions EPA Emissions RegulationsCalifornia Star Labels One Star Low Emission Two Stars Very Low EmissionThree Stars Ultra Low Emission Pre-Operation Inspection OperationWhat To Do Fuel Refueling Oil Ride Plate Impeller Drive Shaft Jet Pump IntakeSteering ThrottleEngine and Storage Compartments Loose Parts SeatFire Extinguisher Battery Hull Drain Plugs and BilgeRiding Gear Switches/Buttons Principles of Operation Engine Break-in ProcedureOperation Give-way Vessel Navigational RulesRight-of-way and Give-way Stand-on VesselRule Encountering VesselsMeeting Vessels Crossing Paths Overtaking VesselsFishing Vessel Right-of-Way Non-Motorized CraftAvoid Collisions Reading Buoys and MarkersLaunch Ramp Etiquette Stopping the Engine Launching the WatercraftStarting the Engine Before Starting the EngineIf the Engine Doesn’t Start Boarding and Starting in Deep Water Operator Only Boarding the WatercraftBoarding With a Passenger Turning the Watercraft Reverse OperationStopping the Watercraft Beaching the Watercraft Operating in Rough Conditions Towing a Disabled Watercraft Righting a Capsized Watercraft Operating With Passengers Daily Care Post Operation MaintenanceOperation Temporary Storage Transporting The Watercraft Submerged Waterlogged Engine Anti-Corrosion TreatmentEngine Water Removal Procedure General Maintenance Maintenance and LubricationMaintenance Schedule Key Periodic Maintenance ScheduleDescription Fuel System Hull / Deck / Steering / Controls Drive Line Steering Cable Joints and Inner WireLubrication Throttle CableSteering Handle Pivot Shaft Seat Latch And Hooks Steering Nozzle Pivot ShaftThrottle Body And Oil Injection Pump Electrical ConnectionsSpark Plugs Maintenance and Lubrication Hull and Deck Care Polaris Nature Oil Synthetic Lubricant OilPolaris VES II Synthetic Lubricant Polaris Premium Gold Synthetic LubricantSteering Cable Inspection FusesThrottle Cable Inspection Antidote BatteryBattery Maintenance and Charging Replenishing Battery FluidBattery Removal Battery Charging Battery Storage Battery InstallationJet Pump Water Inlet Screen Salt Water and Unclean Water CareCooling System Flushing Engine and Exhaust System Draining Extended StorageWatercraft Engine Fogging Procedure Cleaning Lubrication Engine Troubleshooting Engine Doesn’t Turn OverEngine Turns Over But Doesn’t Start Engine Runs Irregularly, Stalls or Misfires Possible Weak Spark Cause SolutionEngine Backfires Engine OverheatsEngine Pings or Knocks Engine Loses PowerUnusual Noise or Vibration From Propulsion System Engine RPM is Too High With Limited SpeedOil and Lubricants Polaris ProductsCapacities / Dimensions SpecificationsPropulsion Obtaining Service and Warranty Assistance WarrantyWarranty Policy Engine Oil HOW to Obtain Warranty ServicePolaris Watercraft Engines California Emission Control System Limited WarrantyOWNER’S Warranty Responsibilities 109 Emissions Index111