2009-2011 Honda FourTrax Rancher AT TRX420FA/FPA Service Manual, Page 211Get this manual
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CYLINDER HEADNALVE TOOLS
U.S .AInterior cutter, 34 mm (EX 60) 07780-0014700
Flat cutter, 33 mm (EX 32) 07780-0012900
Interior cutter, 37.5 mm (IN 60) 07780-0014100