2007-2010 Honda FourTrax Rancher 420 TRX420 TRX Service Manual, Page 220Get this manual
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CYLINDER HEADIVALVE Valve seat cutter, 33 mm (EX 45) 07780-0010800 Flat cutter, 38.5 mm (IN 32) 07780-0012400
or equivalent commercially available in U.S.A
077800014100
Cutter