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Is the fuel injection system normal NO Faulty fuel injection system POOR PERFORMANCE AT HIGH SPEED 1. Please read the GENERAL INFORMATION section to familiarize yourself with basic information concerning the PWC Watercraft. Kawasaki 550Sx Repair Manual For InformationRead and refer to the other sections in this personal water craft manual for information regarding proper inspection and service procedures. Kawasaki 550Sx Repair Manuals And TheIf a modification has been made since then, differences may exist between the content of these Kawasaki JetSki manuals and the actual watercraft. Persons without such knowledge and skills should attempt with caution to service any component or engine by relying on this manual only. Improper repair may result in injury to the mechanic and may render the watercraft unsafe for the JetSki operator and passengers. Fix-Your Problems now with these service manuals available for download. Are the spark plugs wet YES Incorrect spark plug heat range Incorrect spark plug gap Air intake duct or air box obstructed NO GO TO STEP 2. Spark Test Perform spark test. Is there a weak spark or no spark YES Faulty spark plug Fouled spark plug Loose or disconnected ignition system wires Faulty ignition coil Faulty ignition pulse generator Faulty engine control module (ECM) NO GO TO STEP 3. Fuel Injection System Check the fuel injection system. Is the fuel injection system normal NO Faulty fuel injection system YES GO TO STEP 4. Engine Starting Condition Start the engine by following the normal procedure. Does the engine start and then stop Yes Intake air leak Faulty idle air control valve Improper ignition timing (Faulty ECM or ignition pulse generator) Contaminated fuel NO GO TO STEP 5. Cylinder Compression Test cylinder compression. Is the compression low YES Valve clearance too small Valve stuck open Worn cylinder and piston rings Damaged cylinder head gasket Seized valve Improper valve timing ENGINE LACKS POWER 1. Does the engine speed increase NO Air intake duct or air box obstructed Restricted fuel flow Clogged exhaust system Restricted fuel tank breather line YES GO TO STEP 2. Engine Knocking Accelerate or run at high speed. TROUBLESHOOTING 21-3 Is there knocking YES Use of poor quality fuel Worn piston and cylinder Excessive carbon build-up in combustion chamber Ignition timing too advance (Faulty ECM) NO GO TO STEP 3. Spark Plug Remove and inspect the spark plugs. Are the spark plugs fouled or discolored YES Plug not serviced frequently enough Incorrect spark plug heat range NO GO TO STEP 4. Engine Oil Check the oil level and condition. Kawasaki 550Sx Repair Free Of ContaminantsIs the oil level okay and free of contaminants NO Oil level too high Oil level too low Contaminated oil YES GO TO STEP 5. Ignition Timing Check the ignition timing. Is the ignition timing correct NO Faulty engine control module (ECM) Faulty ignition pulse generator YES GO TO STEP 6. Is the fuel injection system normal NO Faulty fuel injection system YES GO TO STEP 8. Engine Lubrication Remove cylinder head cover and inspect lubrication. Is the valve train lubricated properly NO Clogged oil passage YES GO TO STEP 9. Engine Over-heating Test ride and check the engine condition Is the engine over-heating YES Use of poor quality fuel Excessive carbon build-up in combustion chamber Loose or damaged water hose or clamp TROUBLESHOOTING 21-4 Restricted cooling water passage in engine Clogged water passage and filter in jet pump Damaged impeller or water jet stator Check the turbocharger condition. Is the turbocharger normal NO Faulty turbocharger POOR PERFORMANCE AT LOW AND IDLE SPEED 1. Is there leaking YES Loose air intake system fasteners Damaged air intake system O-ring NO GO TO STEP 2. Is there weak or intermittent spark YES Faulty spark plug Fouled spark plug Loose or disconnected ignition system wires Faulty ignition coil Faulty ignition pulse generator Faulty engine control module (ECM) NO GO TO STEP 3. Is the ignition timing correct NO Faulty engine control module (ECM) Faulty ignition pulse generator YES GO TO STEP 4.
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