2007-2009 Honda TRX300EX TRX300X service manual, Page 129Get this manual
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CYLINDER HEADVALVE Using 60 interior cutter, remove 14 of the existi ng valve seat materialTOOLS: Interior cutter, 30 mm (60 INEX) 07780-0014500 Cutter holder, 5.5 mm 07781-0010101 or equivalent comme