Engine.  60^o "V" Twin, 85 x 99, exceptionally large bearings throughout ;  pistons of a special alloy, detachable cylinder heads which are highly polished, including the ports.  Full dry-sump lubrication is incorporated to all moving parts, lubricated by oil under pressure, including valves, tappets and guides.  This engine can be decarbonised quite easily 
in situ.  The exhaust system comprises two heavily chromium-plated pipes of large diameter, leading in to a cylindrical baffled silencer.  Mechanical silence and exhaust note is very quiet and pleasing. 
Frame.  This is the patented and original Brough Superior Loop Design, and the rear wheel is fully sprung to give the very acme of motor-cycling luxury.  All fittings on the Brough Superior Frame are brazed on, part and parcel, there being no loose clips or lugs.  A rolling stand, by means of which the machine can be lifted clear of the ground in an effortless manner, is also incorporated. 
Forks.  These are the special patented bottom link type recommended for sidecar work ; large central compression spring and four shock absorbers operated by a single wing nut.  This fork is very sweet in action, and helps considerably towards giving that feeling of confidence, with the wheels glued to the road, for which the "Brough Superior" machine is so well known.  The patented "Castle" Forks are specially recommended for perfect solo riding and can be fitted to instructions as an extra.  The steering with this latter fork is too well known to be commented upon. 
Carburetter.  A specially designed Amal Carburetter is used.  It has a large single float and mixing chamber.  It helps to ensure very easy starting and terrific acceleration with a very high all-out speed.