The Butterworth Norton
Picture of Butterworth's Swing Valve motor and now being installed in a featherbed frame.
The exhaust valve is conventional and the swing inlet (shaded)
Just swings out of the way! WOW! There are many advantages to this design.
See how many you can work out. Answers next month!
August 6th 2026
Butterworth Norton
markwoodwarw at gmail dot com>
Hello, I am Editor of the UK Norton Owners Club magazine 'Roadholder' and would like to feature the Butterworth Singing-Valve Norton detailed on your website in the magazine. I would obviously credit yourself as the source of the information. Can I ask for permission to do this please?
Regards,
Mark Woodward
You're most welcome to use the content, and I'm sure Norton George would be delighted to see your article on his Singing Valve.
Regards,
10-Feb-2020
milesm at avnet.co.uk
norton
Updated photo for you
Chassis is from a '56 domi 99 (I bought the frame, swingarm & a manx rear wheel from Norton George, who was a pal of mine) and the engine is a 600cc Butterworth swingvalve - Archie Butterworth was my great uncle. Lots on the 'net about him...
Miles McCallum
United Kingdom
