2006-2008-CBF1000-A-24 TROUBLESHOOTING
Contents
1. e Improper valve timing YES GOTO STEP 2 Fuel Pump Inspection Inspect the fuel flow Is the fuel pump unit operation normal NO Faulty fuel pump unit page 6 55 YES GO TO STEP 3 PGM FI System Inspection Check the PGM FI system Is the PGM FI system normally NO Faulty PGM FI system page 6 11 YES GOTO STEP 4 Valve Timing Inspection Check the valve timing page 9 27 Is the valve timing correct NO Camshafts not installed properly YES GOTOSTEPS5 Valve Spring Inspection Check the valve springs Are the valve spring free length as specified NO Faulty valve springs POOR HANDLING Steering is heavy 24 6 Steering stem adjusting nut too tight Damaged steering head bearings Insufficient tire pressure Either wheel is wobbling Excessive wheel bearing play Bent rim Swingarm pivot bearing excessively worn Bent frame The motorcycle pulls to one side Front and rear wheel not aligned Faulty shock absorber Bent fork Bent swingarm Bent axle Bent frame2. 24 TROUBLESHOOTING ENGINE DOES NOT START OR IS HARD POOR PERFORMANCE AT TO START seede 24 2 HIGH SPEED usa 24 6 ENGINE LACKS POWER o n 24 3 POOR HANDLING eesesseeeteeeeeseeeeeeteeeeeetees 24 6 POOR PERFORMANCE AT LOW AND IDLE SPEED area 24 5 24 1 TROUBLESHOOTING ENGINE DOES NOT START OR IS HARD TO START 24 2 1 Spark Plug Inspection Remove and inspect spark plugs Are the spark plugs in good condition NO Incorrect spark plug heat range e Incorrect spark plug gap e Dirty air cleaner YES GOTO STEP 2 Spark Test Perform spark test Are there good sparks NO Loose or disconnected ignition system wires Faulty ignition coil Broken or shorted spark plug wires Faulty CKP sensor Faulty engine stop switch Faulty ignition switch Faulty ECM YES GOTO STEP3 Fuel Pump Inspection Check for operation of the fuel pump and inspect the fuel flow Is the fuel pump unit normal NO Faulty fuel pump unit page 6 55 YES GOTO STEP 4 PGM FI System Inspection Check the PGM FI system Is the PGM FI system normal NO Faulty PGM FI system page 6 11 YES GO TO STEP 5 Cylinder compression Inspection Test the cylinder compression page 9 6 Is the compression specified NO Improper valve clearance Valve stuck open Worn cylinder and piston rings Damaged cylinder head gasket Seized valves Improper valve timing YES GO TO STEP 6 Engine Start Condition Start by following n
3. g type of fuel e Excessive carbon build up in combustion chamber e Ignition timing too advance Faulty ECM e Faulty CKP sensor NO Engine does not knock POOR PERFORMANCE AT LOW AND IDLE SPEED 1 Spark Plug Inspection Remove and inspect spark plugs Are the spark plugs in good condition NO Plugs not serviced frequently enough e Incorrect spark plug heat range e Incorrect spark plug gap YES GOTO STEP 2 Ignition Timing Inspection Check the ignition timing Is the ignition timing as specified NO Faulty ECM Faulty CKP sensor Faulty VS sensor Improper valve timing YES GOTO STEP 3 Fuel Pump Inspection Inspect the fuel flow Is the fuel pump unit normal NO Faulty fuel pump unit page 6 55 YES GOTO STEP 4 PGM FI System Inspection Check the PGM FI system Is the PGM FI system normal NO Faulty PGM FI system page 6 11 YES GO TO STEP 5 IACV Inspection Check the IACV operation page 6 76 Does the IACV operates normally NO Faulty IACV YES GOTO STEP 6 Intake Pipes Leaking Inspection Check for leaks at the insulators or air cleaner housing Are there leaks YES Loose insulator e Damaged insulator e Damaged air cleaner housing TROUBLESHOOTING 24 5 TROUBLESHOOTING POOR PERFORMANCE AT HIGH SPEED 1 Ignition Timing Inspection Check the ignition timing Is the ignition timing as specified NO e Faulty ECM e Faulty CKP sensor e Faulty VS sensor
4. nition timing Is the ignition timing as specified NO e Faulty ECM e Faulty CKP sensor e Improper valve timing YES GOTO STEP 8 TROUBLESHOOTING 24 3 TROUBLESHOOTING 24 4 8 10 11 12 13 Cylinder compression Inspection Test the cylinder compression Is the compression as specified NO Improper valve clearance Valve stuck open Seized valve Worn cylinder and piston rings Damaged cylinder head gasket Improper valve timing YES GO TO STEP 9 Fuel Pump Inspection Inspect the fuel flow Is the fuel pump unit normal NO Faulty fuel pump unit page 6 55 YES GOTO STEP 10 PGM FI System Inspection Check the PGM FI system Is the PGM FI system normal NO Faulty PGM FI system page 6 11 YES GO TO STEP 11 lubrication Inspection Remove cylinder head cover and inspect lubrication Is the valve train lubricated properly NO Faulty oil pump Faulty pressure relief valve Clogged oil strainer Clogged oil passage YES GOTO STEP 12 Over Heating Inspection Check for engine over heating Is the engine over heating YES e Coolant level too low e Fan motor not working e Thermostat stuck closed e Excessive carbon build up in combustion chamber e Use of poor quality fuel e Wrong type of fuel e Clutch slipping NO GOTO STEP 13 Engine Knocking Inspection Accelerate or run at high speed Is the engine knocking YES Worn piston and cylinder e e Wron
5. ormal procedure Did the engine start but stops YES Leaking insulators or air cleaner housing e Faulty starter valves e Improper ignition timing Faulty ECM or CKP sensor e Contaminated fuel ENGINE LACKS POWER 1 Drive Train Inspection Raise wheel off the ground and spin by hand Does the wheel spin freely NO Brake dragging e Worn or damaged wheel bearings YES GOTO STEP 2 Tire Pressure Inspection Check the tire pressure Is the tire pressure correct NO e Faulty tire valve e Punctured tire YES GOTO STEP 3 Clutch Inspection Accelerate rapidly shift from first to second Does the engine speed change accordingly when clutch is released NO Clutch slipping Worn clutch discs plates Warped clutch discs plates Weak clutch spring Additive in engine oil YES GOTO STEP 4 Engine Performance Inspection Accelerate lightly Does the Engine speed increase NO e Dirty air cleaner e Restricted fuel flow e Clogged muffler YES GOTO STEP 5 Spark Plug Inspection Remove and inspect spark plugs Are the spark plugs in good condition NO Plugs not serviced frequently enough e Incorrect spark plug heat range e Incorrect spark plug gap YES GOTO STEP 6 Engine Oil Inspection Check the oil level and condition Is the engine oil in good condition NO e Oil level too high e Oil level too low e Contaminated oil YES GOTO STEP 7 Ignition Timing Inspection Check the ig
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