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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.
Rotate the engine to top dead center, overlap.-J04778 1 of 2. 32 1 is04124a 1. 0.040 inch (1.016 mm) clearance2. 45 degree grind angle3. 0.031 inch (0.7874 mm) minimum margin onexhaust valves and 0.015 inch (0.381 mm) onintake valvesFigure 2. Beveling Valve Heads 3. See Figure 2. 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.