2009-2011 Honda FourTrax Rancher AT TRX420FA/FPA Service Manual, Page 601Get this manual
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TROUBLESHOOTING
3PGM-FI System Inspection
Check the PGM-FI system (page 6-6)
Is the PGM-FI system normal? YES NOGO TO STEP 4- Faulty PGM- FI system
4 Intake Air L