Subaru Robin EA190V - Manual (Page 40)

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e) Use 45°cutter to remove any possible burrs at the edges of the seat.
f) After resurfacing seat, inspect for even valve seating width. Apply
colorant to the valve tapered face, insert the valve and press it
forcefully several times, be sure the valve does not rotate on the seat.
The seating surface, as shown by the transferred marking compound,
should have good contact all the way around.
g) Apply the abrasives to the valve seat face, suitable for running in
when rotating valve seat with valve seat cutter.
h) After reassembling, check the valve clearance
0.8mm
Valve lapping tool