2001-2014 Honda BF/BFP8D, BF/BFP9.9D Outboards Shop Manual, Page 171Get this manual
BFBO-BFS.SO 2) Use the 31 and 60 cutter to narrow and adjust the valve seat so that it contacts the middle of the valve face The 31 cutter removes material from the top edge The 60 cutter removes material from the bottom edge
3) Be sure that the width of the finished valve seat is within
specification Standard valve seat width 0.91.1 mm (0.0350.043 in)
4) Make light pass with 45 cutter to remove any possible burrs at the edges of the seat5) After resurfacing the seats, inspect for even valve seatingApply Prussian Blue compound or erasable felt tipped marker ink to the valve faces Insert the valves, and then lift them and snap them closed against their seats several timesBe sure the valve does not rotate on the seat The seating surface, as shown by the transferred marking compound, should have good con tact all the way around VALVE LAPPER 6) Lap the valves into their seats, using hand valve lapper and lapping compound (commercially available) 7) Check valve clearance after assembly