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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 seat to back angle of 95 to 120 degrees. For maximum comfort, the seat back should be no more than 14 to 16 above the seat. Arm rests are recommended for easy in/out and they average 5 to 8 in height and 2 to 4 in width.