2007-2010 Honda FourTrax Rancher 420 TRX420 TRX Service Manual, Page 585Get this manual
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TROUBLESHOOTING
Check the PGM-FI system (page 6-6)Is the PGM-FI system normal?
- Faulty PGM- FI system
- GO TO STEP 4,
4 Intake Air Leak Inspection Check f