2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 217Get this manual
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CYLINDER HEADVALVE Using 60 interior cutter, remove 14 of the existing valve seat materialTOOLS: Interior cutter, 37.5 mm (60 IN) Interior cutter, 34 mm (60 EX) Cutter holder, 5.5 mm Cutter holder, 5.