1986-1987 Honda Fortrax TRX70 Service Manual, Page 54Get this manual
CYLINDER HEADIVALVES Measure the valve seatSERVICE LIMIT: .6 mm (0.0 inl If he seat is too ide, too narrow, or has low spots, it must be refaced to seal properly
VALVE SEAT GRI NDI NG
Use 45 cutter to remove any roughness or irregularities rom seat NOTE
(1 OLD SEAT WIDT H
Reface the seat with 45 cutter when the valve guide is replaced
Use 32cutter to remove 1 of the existing valve seat mat rialNOTE