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- Nov 26, 2009
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The old domni 500ss and 650ss offered the same size valves as Norton used in their 750s and 850s - 1-1/2 in and 1-5/16 ex. They just increased the bore and didn't bother enlarging the valves size to suit. See 500 and 850 pistons below.
They should have upped the valve diameters - there's room for them and its what the bigger motors need.
![Big valves or small valves Big valves or small valves](https://scontent.fden3-1.fna.fbcdn.net/v/t39.30808-6/r270/p526x395/271176708_10222074313986502_1299169532116862786_n.jpg?_nc_cat=106&ccb=1-5&_nc_sid=0debeb&_nc_ohc=Syo2kN5Ba5sAX9-lJnT&_nc_ht=scontent.fden3-1.fna&oh=00_AT_d5k1KspkWvLOTOnd2IcxvYQXHzJbLZwnTUeZhrfZWog&oe=61D63181)
They should have upped the valve diameters - there's room for them and its what the bigger motors need.