2009-2011 Honda FourTrax Rancher AT TRX420FA/FPA Service Manual, Page 99Get this manual
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MAINTENANCE
TORQUE: 12 N'm (1.2 kgf'm, 9lbHt)
OIL CHANGE Place the vehicle on level surfaceRemove the drain bolt and the filler cap to drain the oilWhen the oil is completely draine