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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.
And you will need two of these to adjust the lifters with. A good seat should look like this. Make sure you get all the valve grinding compound out when youâre done. grinding the seats or it will continue to grind and eat up your new guides. Step Four: Put your valve assemblies together on the bench.