Poor Performance At Low And Idle Speed - Honda CRF450X 2005 Service Manual

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POOR PERFORMANCE AT LOW AND IDLE SPEED
1. Pilot Screw Inspection
Check carburetor pilot screw adjustment.
Is the adjus tment correct?
NO - See page 6-27.
YES - GO TO STEP 2.
2. Accelerator Pump Inspection
Check accelerator pump for clogs.
Is the Bees/erator pump cioggBd7
YES - Accelerator not serviced frequently enough.
NO - GO TO STEP 3.
3. Intake Air Leak Inspection
Check for leaking carbu retor insulator.
Is there lesking ?
YES _ . Loose carburetor insulator band s
• Damaged insulator
NO - GO TO STEP 4.
4. Spark Test
Perform spark test.
Is thera wesk or Intermittent spark ?
YES _ . Faulty spa rk plug
• Fou led spa rk plug
• Loose or disconnected ignition system wires
• Broken or shorted ignitio n coil wire
• Faulty ignit ion coil
• Fau lty ignition pulse generator
• Faulty exciter coil
• Fau lty engine stop button
• Faulty ignit ion control module OCM )
NO - GO TO STEP 5.
5. Ignition TIming Inspection
Check ignition timing.
Is the ignition timing correct?
YES - Ignition timi ng is normal.
NO _ . Faulty ignition control module (ICM)
• Faulty ignition pu lse generator
TROUBLESHOOTING
22-5