2006 Honda TRX680 Rincon Factory Service Manual, Page 217Get this manual
CYLINDER HEADVALVECAMSHAFT Using 32 flat cutter, remove 14 of the existing valve seat materialTOOLS: Flat cutter, 38.5 mm (IN) Flat cutter, 35 mm (EX) Cutter holder, 5.5 mm
07780-0012400 07780-0012300 07781-0010101
OLD SEAT WIDTH
or equivalent commercially available in U.S.A
Using 60 interior cutter, remove 14 of the existing valve seat materialTOOLS: Interior cutter, 34 mm (INEX) 07780-0014700 Cutter holder, 5.5 mm 07781-0010101 or equivalent commercially available in U.S.A
OLD SEAT WIDTH