2007-2010 Honda FourTrax Rancher 420 TRX420 TRX Service Manual, Page 234Get this manual
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CYLINDER HEADIVALVE Install the cylinder head on the cylinderBe careful not 0 leI Ihe nuts and washers fall infO rhe
TORQUE: 12 N'm (1 .2 kgfmIbf.ft) Install the spark plug and tighten it TORQUE