Honda B75K2-B75K3 Outboard Motors Manual., Page 15Get this manual
Inspection 1Valve-to-guide clearance Insert valve into the valve guide, and measure the clearance between the two with dial gauge in two directions, and YIf the clearance is out of specification, replace the valve and valve guide as an assembly(Service data: page 55
Fig3-44 (D Da gauge il
2Valve seat width Apply thin coat of red lead or Prussian blue to the valve seat surfacePress the valve against the seat and rotate it to check the seatingIf the seating is improper, lap the valve and seat, and recheckIf the seating is still improper or if the seat width exceeds 1.5 mm (0.059 in, reface the valve seat with valve seat cutterValve seat refacing First cut the valve seat with the 90' valve seat cutter (Tool No07980-9210100)Then narrow the seat width with the flat valve seat cutter (Tool No07980-9210200 for intake valves and Tool No07980-9210400 for exhaust valves)Seat width specification0.7- 1.0 mm (0.028-0.039 in