1957 BSA A10 Gold Flash


  • Two owners from new
  • Beautifully and sympathetically restored
  • Practical and usable classic bike

The Appeal

The BSA A10 series was a range of 646 cc (39.4 cu in) air-cooled parallel-twin motorcycles designed by Bert Hopwood and produced by Birmingham Small Arms Company at Small Heath, Birmingham from 1950 to 1963. BSA, then the largest UK motorcycle manufacturer, was falling behind in the parallel-twin race after the introduction of the 650cc Triumph Thunderbird. Although BSA had a 500cc parallel-twin, the BSA A7, they needed to develop a 650 to remain competitive. Hopwood, after only a year at rivals Norton, was persuaded join BSA and was tasked to produce a 650cc parallel-twin; the A10 Gold Flash was launched in October 1949. 

This example has been completely restored by the vendor as a BSA Rocket Gold Star replica, a later incarnation of the A10 that he coveted as a youngster. 

The History and Paperwork

  • Vendor bought the bike from original owner
  • Restored as ‘lockdown project’
  • Current V5
  • MoT- and tax-exempt
  • Haynes workshop manual
  • BSA Service manual 

The bike was bought new from dealer Owens of Clapham in 1957. The first owner used it until the later purchase of a car, at which point he put into storage where it remained until 2019! The vendor purchased it from the original owner and intended to restore it to original spec, but then decided to try and update the bike’s rather staid image and to create a bike similar to those he remembered from his youth, chrome bikes such as those sold by Southampton importer Lawton and Wilson but which he could never afford. He also owned, in the late 60s, a BSA Gold Star which also inspired the restoration. 

Because the bike was disinterred from its long-term storage, there was no accompanying documentation, hence there is very little paperwork, but the vendor will supply an original Haynes A-series manual and a BSA service book. 

Having completed all the work, the vendor has decided that his advancing years make it impractical for him to ride the bike as intended, and he has reluctantly decided to sell it. 

The Condition

  • High-quality restoration
  • Looks fantastic
  • Lots of stainless-steel fittings
  • Original parts also supplied 
The vendor restored the bike as a ‘lockdown’ project, having previously restored a number of classic cars. From first glance at the bike, it’s clear that he is a talented and capable engineer; it looks simply fantastic, and everything has clearly been done to astonishingly high standards. 
The fuel tank has its original overall chrome; while this is mirror-finished on the sides it has the industrial-grade chrome finish to the top for the original paint scheme to adhere to; the vendor’s preference was to leave the chrome unpainted. 
The wheel rims and spokes are stainless-steel as are the mudguards and brackets, fork covers, headlamp brackets, instrument bracket, and exhaust pipes. The lamps have been fitted with LED bulbs, while the original mudguards and headlamp nacelle remain with the bike, should the new owner prefer to refit these.
The bike is currently fitted with a single seat but the vendor can supply a dual seat with the bike. 

The Mechanics

  • 650cc parallel-twin engine
  • Engine fully rebuilt
  • New clutch
  • Electronic ignition
  • New battery 
  • New wiring loom
  • New tyres and tubes

The vendor reports that the bike starts and runs beautifully, but he feels that he can no longer ride it. 

The engine has been built with new bearings, but the bores remain standard with new pistons and rings. The gearbox has been disassembled, was found to be in good condition, and cleaned out. 

A cartridge oil filter was fitted to the oil tank’s return line, and the tank thoroughly flushed.
The bike has also had new clutch plates and springs, new cables and new classic tyres and tubes.
As part of the restoration, and to make the bike usable in modern road conditions, the vendor has fitted a new wiring loom, a new Powerline AGM battery, and LED lamps. The bike also has Sparkrite electronic ignition, controlled by magneto points, and a DVR2 voltage regulator.
The vendor also managed to fabricate an angle-drive mechanical rev counter, as these are no longer available, having had experience of these when restoring his Austin-Healey car. The speedometer was rebuilt and zeroed, hence the lack of a recorded mileage.


Having bought the bike in poor condition, the vendor has clearly achieved an astonishing restoration. This is a bike that could hold its head high at any classic bike event, and must appeal to any British-bike enthusiast. As well as looking amazing, it’s been restored to be used and promises the new owner a thrilling riding experience. 

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Vehicle specification
  • Year 1955
  • Make BSA
  • Colour Grey
  • Odometer 0
  • Engine size 650
  • Town Southampton
Auction Details
  • Seller Type Private
  • Location Hampshire
  • Country United Kingdom
Bidding history
18 bids
  • gurkha1•••• £6,700 22/08/22
  • prospec•••• £6,500 22/08/22
  • gurkha1•••• £6,200 22/08/22
  • prospec•••• £6,000 22/08/22
  • gurkha1•••• £5,500 22/08/22
  • seadive•••• £5,300 22/08/22
  • vincent•••• £5,200 19/08/22
  • gurkha1•••• £4,800 18/08/22
  • vincent•••• £4,500 18/08/22
  • seadive•••• £3,900 17/08/22

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