2007-2010 Honda FourTrax Rancher 420 TRX420 TRX Service Manual, Page 105Get this manual

2007-2010 Honda FourTrax Rancher 420 TRX420 TRX Service Manual, Page 105

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MAINTENANCE
Check the insulator for cracks or damage, and the electrodes for wear, fouling or discolorationReplace the plug if necessary
RECOMMENDED SPARK PLUG:
BKRSE ll (NGK), K16PR