The Vincent Comet was designed and built at the Vincent works in Great North Road, Stevenage, Hertfordshire, England. It was one of four 499 cc single models.
An unusual feature of the valve design for these motors was the double valve guides, and the attachment of the forked rocker arm to a shoulder between the guides, to eliminate side forces on the valve stem and ensure maximum valve life under racing conditions.
The 499 cc single-cylinder, high-camshaft OHV, air-cooled Vincent engine had a light alloy barrel and cylinder head with a cast-iron liner, and a ‘backbone’ type combined frame and oil tank.
The engine acting as a stressed member of the frame, and most other components in common with the post-war twin-cylinder models.This fast and amazing bike has been built for a real sport man.