Engine Does Not Start Or Is Hard To Start - Honda MUV700 big red Service Manual

TROUBLESHOOTING
ENGINE DOES NOT START OR IS HARD TO START
26-2
1. Spark Plug Inspection
Remove and inspect spa rk plug.
Is the spark plug in good condition?
NO - . Incorrect spa rk plug heat range
• Incorrect spa rk plug gap
• Dirty air cleaner
YES - GO TO STEP 2.
2. Spark Test
Perform spark test.
Is there weak or no spark?
YES - . Loose or disconnected ignit ion system wire
• Faulty ignitio n coil
• Broken or shorted spark plug wire
• Loose or disconnected ignition system wires
• Fau lty CKP sensor
• Faulty engine stop swit ch
• Faulty ig nition switch
• Faulty PCM
NO - GO TO STEP 3.
3. Fuel Pump Inspection
Check fo r operation of the fuel pump and inspect the fuel flow.
Is the futl! pump unit normal?
NO _. Faulty fuel pump unit
YES - GO TO STEP 4.
4. PGM- FI System Inspection
Check the PGM-FI system .
Is the PGM-FI s ystem normal?
NO - Faulty PGM- FI system
Yes - GO TO STEP 5.
5. Cylinde r Compression
Test cylinde r compression.
Is the compression low?
YES _ . Valve clearance too small
• Valve stuck open
• Worn cyli nder and piston rings
• Damaged cylinder head gasket
• Seized valve
• Improper valve timing
NO - GO TO STEP 5.
6. Engine Start Condition
Start by followi ng normal procedure.
Did the engine start but s tops?
YES - . Leaki ng intake manifold
• Leaking intake pipe
• Improper ig nition timing !Fau lty PCM or CKP sensor)
• Contaminated fuel