BSA M24500
BSA M24500 | |
Manufacturer | |
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Production | 1937 - 61 |
Engine | Four stroke single cylinder, OHV |
Ignition | Lucas magdyno |
Transmission | 4-Speed |
Frame | Triangulated cradle type |
Suspension | Front: Quick adjustable shock absorbers with steering damper Rear: None, spring loaded saddle |
Brakes | Front: Drum, 7.5 in Rear: Drum, 7.5 in |
Front Tire | 3.00 x 20 in, Dunlop Universal |
Rear Tire | 3.25 x 19 in, Dunlop Universal |
Wheelbase | 1372 mm / 54 in. |
Weight | |
Fuel Capacity | 13.6 L / 3.6 US gal |
Manuals | Service Manual |
Engine[edit | edit source]
The engine was a Air cooled cooled Four stroke single cylinder, OHV.
Drive[edit | edit source]
Power was moderated via the Multi-plate cush drive.
Chassis[edit | edit source]
It came with a 3.00 x 20 in, Dunlop Universal front tire and a 3.25 x 19 in, Dunlop Universal rear tire. Stopping was achieved via Drum, 7.5 in in the front and a Drum, 7.5 in in the rear. The front suspension was a Quick adjustable shock absorbers with steering damper while the rear was equipped with a None, spring loaded saddle. The M24500 was fitted with a 13.6 L / 3.6 US gal fuel tank. The wheelbase was 1372 mm / 54 in. long.
Photos[edit | edit source]
Overview[edit | edit source]
BSA M24
Following the arrival at BSA in 1936 of Val Page, the new range of motorcycles for 1937 revealed a significant redesign of the single cylinder engines, with the adoption of dry sump lubrication. The all new M20 500cc side-valve engine, and the M19, M22 & M23 OHV engines as pictured above, were to form the basis for all larger capacity BSA single cylinder engines until the final 500cc Gold Star in 1962.
Based very closely on the 500cc M23 Empire Star, first produced for 1937, the 1938 production model Gold Star shared most of the older models cycle parts, except the frame, which was constructed of lighter Reynolds 531 high-tensile tubing, the petrol tank, which was unique to the Gold Star in having an integral tool box in the top, in place of the instrument panel, and the rear brake drum which sported thin fins around its diameter. The ammeter and light switch were housed in a panel in the headlamp shell. The other main visible differences were the all-alloy engine with built-in pushrod tunnel, the TT carburetor, and the Elektron gearbox cases. The M24 also had a small tubular oil pressure indicator mounted above the timing case in place of an indicator button in the tank top instrument panel of the M23. The first production M24s , bearing Engine and Frame numbers starting at 101 and prefixed JM24, were built in November/December 1937, and the first batch of 10 were dispatched on 17th December. Production of 1938 Gold Stars continued until the autumn of 1938, when the factory switched to production of the new 1939 model. The last one, engine JM24 365, in frame JM24 404, was dispatched on 6th July 1939 to the British Army for the 1939 ISDT.
A total of approximately 266 1938 JM24 bikes were built, and of these, 85 were despatched to destinations outside the UK.
"M24 competition model"
Make Model | BSA M24 (1938 specifications) |
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Year | 1937 - 61 |
Engine Type | Four stroke single cylinder, OHV |
Displacement | 498 cc / 30.4 in |
Bore X Stroke | 82 x 94 mm |
Cooling System | Air cooled |
Lubrication | Dry sump |
Carburetor | Amal 10TT |
Exhaust | Single, chrome |
Ignition | Lucas magdyno |
Clutch | Multi-plate cush drive |
Transmission | 4-Speed |
Final Drive | Chain |
Frame | Triangulated cradle type |
Wheelbase | 1372 mm / 54 in. |
Ground Clearance | 121 mm / 4.75 in |
Saddle Height | 724 mm / 28.5 in. |
Front Suspension | Quick adjustable shock absorbers with steering damper |
Rear Suspension | None, spring loaded saddle |
Front Brakes | Drum, 7.5 in |
Rear Brakes | Drum, 7.5 in |
Wheels | Steel, laced spokes |
Front Tire | 3.00 x 20 in, Dunlop Universal |
Rear Tire | 3.25 x 19 in, Dunlop Universal |
Fuel Capacity | 13.6 L / 3.6 US gal |
Colours | Black/chrome, Chrome/matt silver |