Bsa owners club, uk the bsa ‘parent club’ set up in 1958 this site contains a large amount of material relating to bsa and its history bsa service sheets this site has 112 pdfs of bsa service sheets for a7, a10, b31, b32, b33, b34, b40, c10, c11, c12, c15, d1, d3, d5, d7, m20, m21, m22, and m33 models not all sheets are there. Bsa gold star owners club engine & frame numbers by year engine & frame numbers by year year model notes engine number frame number notes 1938. The bike standing right now it is known as the bsa 500cc this is the 1942 model a lot of people know it by its short name the m20. Wdbsanl the bsa wd m20 website the bsa wd m20 website photos forum bsa dating service bsa dvd's frame numbers bsa tank numbers technical-section historic-info accessories visitors-bsa's photo's bsa-links civilian-m20.
The m21 initially had a bore and stroke of 85mm x 105mm for a swept volume of 595cc in 1938 it was brought into line with the m20 with a bore of 82mm and a 112mm stroke giving 591cc a similar bore as the m20 turned the m21 into a long stroke version of the 500 and meant the factory could use common engine parts. Buyers premium on all automobilia lots (lots 1-76) will adhere to bonhams group policy, 25% up to £50,000 of hammer price, 20% from £50,001 to £1,000,000 of hammer price, and 12% on the balance thereafter. Vintage - 1905-1934 due to the rarity of these years and models of bsa, pricing data is still being collected bsa production ceased in 1973 it is not usual to find a bsa motorcycle titled and registered in the united states as a post 1973 model this is due to these models being titled and licensed as the year it was registered.
Bsa m21 if character is more important to you than performance, then take a look at the m-series machines the sidevalve beesa sloggers came in two sizes as the 13bhp, 496cc m20 and 15bhp, 591cc m21 they first joined the bsa range in 1937 with girder front ends, and saw extensive military service. The number is stamped onto a raised pad the frame number is located for bsa's 1969 and earlier on the left side of the frame, on the front engine mounting lug bsa's 1971 and later, either side of the frame on the stearing head to frame gusset, note that these don't always have the model stamped. Some da ta on the system used in the 1930s is included and also the series used by the ariel h untmaster 646 cc twin, in case you find one in your bsa frame prewar models from 1932-35 bsa used a system based on numbering the annual model range from 1 upward, plus a prefix letter for the model type.
The bsa m20 was a british motorcycle made by birmingham small arms company (bsa) at their factory in small heath, birmingham although initially viewed as a near failure by the war office in 1936, the m20 evolved into one of the longest serving motorcycles in the history of british military motorcycling, as well as becoming the most numerous type produced for world war ii with 126,000 in active service. Aermacchi vin numbers amc ajs/matchless from c1935 engine numbers usually start with the year of production, followed by model designation, and completed with the production number of the motorcycle. Bsa m20 the bsa wd m20 website, the bsa wd m20 website photos: forum bsa dating service bsa dvd's frame numbers bsa tank numbers maintenance manual welcome to the world of bsa b50, maintenance manual and instruction book for motor cycle (solo) 500 cc sv model m20 index general pages pages brakes 28 front. 1931: back to identification page model: engne prefix: engine sequence: frame prefix: frame sequence: cc 249 hp b31-1 y1 101 y1 101 m20 tourer hm20 101 hm19 101 500 m22 ohv sports hm22 101 hm19 101 500 m23 ohv empire star hm23 101 hm19 101 500 m21 tourer hm21.
1944 bsa m20 x irish army sold, £3950 1944 bsa 500cc side valve ex irish army copy of dating cert from bsa owners club with copy of re. Bsa used a system of letters and numbers for yearly identification of their machines before you proceed be sure to read the introduction page introduction to bsa machine numbering system. Eggers shot to national attention in 1954 when he sailed to fifth place in the grand national series opener at daytona, riding a bsa shooting star bsa took the top five spots, and the famed bsa wrecking crew was born. For sale is my unfinished project the bike is registered ysy793(not transferable )the bike comes with bsa certificate stating the bike is 1955 and v5, have put d3 engine into the framethe log book will have to be sent to dvla for engine change and the correct dating 1955any further details you can ring me on 01544=231054.
Bsa model m20 496 cc sv single-cylinder 1937 (improved version) having noted the comments of the mee about the w35-6 model of 1935 and the original m20 model of the following year, bsa supplied a further three m20 models to the war office under contract 294/c991 during 1937. Bsa m20 history:viewed as a near failure in the eyes of the war office in 1936 this model was ultimately to evolve into perhaps the most illustrious and longest serving model in the history of british military motorcycling not to mention becoming the most numerous type produced for the war office itself. Motorcycle dating & registration service this is a simple guide on how to date your bsa motorcycle you will also be able to use this process to register your bsa with the dvla.