2007-2010 Honda FourTrax Rancher 420 TRX420 TRX Service Manual, Page 231Get this manual
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CYLINDER HEADIVALVE Using 60 interior cutter, remove 14 of the existing valve seat materialTOOLS: Interior cutter, 37.5 mm (SOQIN077800014100 Interior cutter, 34 mm (SO EX) 071800014700 '01'08 models: