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Valve Jobs Done Right. A close-up of a Honda CB750 SOHC valve seat. Though the upper 30 degree and the lower 60 degree shapes have been rough cut using Neway cutters, the 45 degree cut in the middle, the one that counts because it is the actual sealing surface, has the benefit of a stoned surface, the best possible with hand tools. Ah, valve jobs.
A 0.040-inch (1.016 mm) clearance (1) isrequired between the two valve heads. Use a wire gaugeto measure.To adjust the clearance, grind the edges ofthe intake and exhaust valves at a 45Â° angle as shown.NOTEIf the minimum margin of valves is reached before 0.040 inch(1.016 mm) valve-to-valve is achieved, the valve will need tobe sunk further into the head by cutting the valve seat. 0.040-inch (1.016 mm) clearance (1) isrequired between the two valve heads. Use a wire gaugeto measure.To adjust the clearance, grind the edges ofthe intake and exhaust valves at a 45Â° angle as shown.