2007-2009 Honda TRX300EX TRX300X service manual, Page 353Get this manual
TROUBLESHOOTING
POOR PERFORMANCE AT LOW AND IDLE SPEED
1Pilot Screw Inspection
Check carburetor pilot screw adjustment
Is the adjustment correct?
- For pilot screw adjustment (page 5-23)- GO TO STEP 2
2Intake Air leak Inspection
Check for leaking carburetor insulator
Is there leaking?
YESloose carburetor nsulator bands Damaged insulator
- GO TO STEP 3
3Spark Test Perform spark test
Is there weak or intermittent spark?