2006-2012 Honda TRX90 TRX90EX/X Service Manual, Page 285Get this manual
TROUBLESHOOTING
POOR PERFORMANCE AT LOW AND IDLE SPEED
1Air Screw Inspection Check carburetor air screw adjustmentIs the adjustment correct? NO
- See page 5-16- GO TO STE 2
2Intake Air Leak Inspection Check for leaking carburetor insulatorIs there leaking?
YES _loose carburetor insulator bands Dama'ged insulator
- GO TO STEP 3
3Spark Test Perform spark test Is there weak or intermittent spark?