Poor Performance At Low And Idle Speed - Honda 2004 CRF250X Service Manual

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POOR PERFORMANCE AT LOW AND IDLE SPEED
1. Pilot Screw Ins pection
Check carburetor pilot screw adjustment.
Is the adjus tment correct?
NO - See page 5-27
YES - GO TO STEP 2.
2. Accelerat o r Pump Ins pection
Check accelerator pump for clogs.
Is the acceJerator pump clogged ?
YES - Accelerator not serviced frequently enough
NO - GO TO STEP 3.
3. Intake Air l eak Inspection
Check for leaking carburetor insulator.
Is there Jeaki ng?
YES - . loose carburetor insulator bands
• Damaged insulator
NO - GO TO STEP 4.
4. Spark Test
Perfor m spark test.
Is there weak or intermittent spark?
YES _ . Faulty spark plug
• Fouled spark plug
• Loose or disconnected ignition system wires
• Broken or shorted direct ignition coil wire
• Faulty direct ignition coil
• Faulty ignition pulse generator
• Faulty exciter coil
• Faulty engine stop button
• Faulty ignition control module (lCM)
NO - GO TO STEP 5.
5. Ignition Timing Inspection
Check ignition timing.
Is the ignition timing correct?
YES - Ignition timing is normal
NO _ . Faulty ignition control module (ICM)
• Faulty ignition pulse generator
TROUBLESHOOTING
21-5