Ignition Troubleshooting - Arctic Cat Cougar Service Manual

48
CHAPTER TWO
IGNITION TROUBLESHOOTING
I
Engine will not start,
but fuel and spark are good
1 1 - - - - - - - 1 Check:
I •
Defective or dirty spark plug
• Spark plug gap set too wide
• Incorrect ignition timing
• Shorted stop switch
• Broken piston ring(s)
• Cylinder, crankcase or cylinder head air leak
• Worn or damaged crankcase seal(s)
• Damaged CDI unit
• Damaged magneto coil(s)
• Damaged ignition coil
I
Engine misfires at idle t - - - - - - - - 1 Check:
' - - - - - - - - - - - - - - - - - - - - ' • Incorrect spark plug gap
• Defective, dirty or loose spark plug
• Incorrect heat range spark plug
• Leaking or broken high tension wire
• Incorrect ignition timing
• Damaged CDI unit
• Damaged generating coil
• Dirty wiring connection
• Damaged ignition coil
l
Engine misfires at high speed
I
Check:
• See Engine misfires at idle
• Coil breaks down
• Coil shorts through insulation
• Spark plug gap too wide
• Incorrect spark plug heat range
• Incorrect ignition timing
I
Engine backfires through exhaust 1 - - - - - - - - 1 Check:
' - - - - - - - - - - - - - - - - - - - - ' • Cracked spark plug insulator
• Incorrect ignition timing
• Damaged CDI unit
I
Engine preignition 1 - - - - - - - - 1 Check:
' - - - - - - - - - - - - - - - - - - - - ' • Incorrect ignition timing
I
Spark plug fouls
I
• Incorrect spark plug heat range
• Burned spark plug electrodes
Check:
• Incorrect spark plug heat range
• Fuel mixture too rich
• Overheated engine
• Poor quality fuel
• Excessive carbon buildup
in combustion chamber
• Incorrect ignition timing