Lot 303 - 1923 Dot Bradshaw 350cc ‘Oil Boiler’

From the Hitchcock’s Motorcycle Collection

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Auction MCN London Motorcycle Show February 2017
Auction Date
Day of Auction

Lot Details

Lot Number 303
Reg. Number CL 6248
Chassis Number 2037
Year 1923
Make Dot Bradshaw
Model 350cc ‘Oil Boiler’

+44 208 614 7888

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The name “Dot” was originally adopted in honour of a young lady named Dorothy. By the 1920’s the marque was declaring that “Dot” stood for “Devoid of Trouble”. Founded in 1903 by former racing cyclist Harry Reed, the company was little known until 1908, when Reed, riding a 680cc Dot powered by a 5hp Peugeot V-twin, won the Senior TT with just a spoonful of fuel left in his tank.


Racing Dots achieved many victories on the Brooklands circuit, first with Peugeot V-twin power, and subsequently with JAP engines. By 1923, Dot was offering an entirely JAP-powered range – 300 and 350cc singles and a 1000cc V-twin – then in mid-season added an oil-cooled 350cc Bradshaw engine to the line-up. Dot became the biggest customer for the “oil-boiler” Bradshaw, which remained in its catalogue until 1928.


The Bradshaw engine’s cylinder barrel is devoid of finning. Integral with the crankcase, it contains an iron liner surrounded by a cavity in the alloy casting. Engine oil, stored in a wet sump, is pumped to the big-end from where it splashes up into the cylinder jacket. The iron cylinder head is air-cooled in the conventional way.


This rare and interesting motorcycle still retains it’s distinctive red paintwork and remains in overall good condition despite being stored unused in the collection for many years. A worthy restoration project it is supplied with a buff logbook stating the date of manufacture as 26th November 1923 and current UK V5C logbook bearing the registration number CL 6248.


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