BSA Engine & Frame number system

Dating bsa bantam, club rally information

BSA 500 & 650 Unit Twins Engine & Frame Numbers (1962-68)
BSA motorcycles

The old exhaust pipe bore was found too restrictive for the new tune up, so a larger one was fitted. Only the Bushman retained the direct lighting, with all other models utilising a coil driven battery lighting system. Evidently the Bantam was being used more for commuting because a dual-seat option was offered, naturally rear footrest lugs were added to the frame. Both models had better front brakes than earlier models.

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Swing arm models had a longer silencer and shorter exhaust, necessiated by no longer being able to support the end of the silencer by the frame. Engine markings Engine numbers are easier to find usually by the crankcase mouth on the primary side. This article needs additional citations for verification.

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They included indicators and every mod con that was going, and they were most importantly cheaper. Some poor marketing decisions and expensive projects contributed to substantial losses. Please help improve this article by adding citations to reliable sources. This is more common of modern practice, to merely re-package the same thing in a different finish and charge you more for the privilege, saving the company producing two sets of engines etc.

This model was a common commuter motorcycle, and many survive today. Asides from the diminished fuel efficiency, the high compression ratio made the bike notorious for difficult starting, as is normal with high performance engines. Machines with better specifications were available for those who wanted more performance or for competition work. In response, the Triumph workers at Meriden set up their own cooperative. The Black Bantam also came into being, offering another paint than the standard mist-green.

The cylinder was able to be safely bored out, increasing capacity to cc. They would however have some machines in stock so that so that it is possible that a July model may be to either the previous or the next year's specification. Front engine mounting lug but the engine and frame numbers are the same. Chrome also hit the scene, with plated wheel rims and fuel tank seam covers. Many changes were made to these models, the most noticeable fitting the silencer in an upswept position.

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  • If you know of any discrepancies please email us.
  • Exceptions are the Bantams which could be stamped on the front mounting point or just behind the crankcase mouth.
  • The Sports and Bushman models also gained heavier front forks.
  • These could be stamped anywhere and often were not stamped at all!
  • At the same time there were redundancies and the selling of assets.

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Collecting, Restoring and Riding Classic Motorcycles. The gears ratios were altered to combat this problem, giving the engine an easier time. Both the latter models had high-level exhaust pipes, and other quite major changes to the cycle parts. The list was compiled painstakingly by the club's Librarian Steven Foden. Sometimes they were despatched months earlier or later so the lettering system should just be taken as a rough guide.

Apart from the obvious decrease in range, this had the effect of making the Bantam look slightly lanky, when it was never a particularly muscular bike in the first place. The Bantam was one of the first bikes to be used in this way, trials before that had been more professional events run by substantially larger bikes. The exception is the early Bantams where the frame number is between the front engine mounting plate.

BSAOC Machine Dating

Engine numbers are easier to find usually by the crankcase mouth on the primary side. The electrical system was further revised with a new type of Wipac alternator and rotor. Ignition was supplied from the same unit, in the form of a simple Magneto, services this also eliminated the need for a battery.

BSA Engine & Frame number system

This varies from model to model but usually it is on the front top frame member either by the front seat stay or by the steering head. British motorcycle manufacturers. However, the plan involved the axing of some brands, large redundancies and consolidation of production at two sites. Up until it is rare for the engine and frame number to be identical and where the frame is shared by several models the codes start with the smallest model e.

In addition, the front suspension was made more substantial in volume and the cylinder was not simply bored out but was enlarged with distinctive larger thermal cooling fins. These are usually faint and small. The main visual change to the engine was the addition of an outer cover to the nearside, enclosing the generator. The engine and frame received the same markings. The exhaust pipe was routed above the footrests, dating a guy giving an overall more pleasant line to the bike.

This change of generator caused the points to be evicted to the other side of the engine. Also this carried through to some but not all of the engines. It is recognisable by the slanted monobloc carburetter protruding from its rear.

This listing shows only the main variants and most models were available with refinements or in competition form. Engine and Frame Number Introduction Identifying your machine. This is a shady area at best so please don't quote me one it. The first was the Sports model with Chrome mudguards, a fly-screen and a hump on the rear of the dual-seat. Rigid suspension production was stopped, india as was all the range's competition models.

The Japenese bikes offered less engine life, slower top speeds, less fuel efficiency. After frame the engine and frame markings were the same. Identifying engine and frame numbers, agency dating season onwards.

A Unit Twins 1962-65


From Wikipedia, the free encyclopedia. Not all Bantams look as good as this. Some Bantams on the engine mounting plate, these sometimes break and re- welding obliterates the stamping.

High-level exhausts were made for the trials and off-road models, in which the only electrics are the magneto-powered ignition. Early gearboxes were weak and unreliable. The system incorporated a external ignition coil, powered by a battery. This was the first case of a one brand sweep. The engine was further increased to cc.

DVLA & Machine Dating
  1. The Sports model, in my opinion the best looking of the swing-arms was dropped, leaving the Supreme and Bushman to stand it alone.
  2. The bulk of use would be for commuting.
  3. Manufacturing in the United Kingdom.
  4. On the front down tube below or in front of the petrol tank.
  5. Rubber Gaiters were added to the front forks to prevent debris from interfering with the motion of the forks.

As the result of increased post war demand the Small Heath, Birmingham factory was turned over entirely to motorcycle production. Black or Polychromatic Blue with two tone tank, painted above, chrome plate below. Machines still in stock in the season about were resold in the and season. The cylinder head had a second hole for a decompressor to be fitted and a folding-kickstart. The barrel is cast iron while the head is alloy.

DVLA & Machine Dating - BSA Bantam Club

Please help improve this section by adding citations to reliable sources. The code consisted of three parts, the first as two letters giving month and year respectively, the second was a five digit number and the third a model code. Owners modified their bantams, fitting non-standard sprockets and wider handlebars.

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