BSA 1930 4.93 HP OHV de Luxe Model S 30–13 “Sloper” frame# XH8565 engine# XP.1610.
Presented in august 1926 for the 1927 season, the sloper set the BSA company on the road to market domination and success.
It was brilliant designer Harold Briggs, brought in from the Daimler car company, who designed the machine around a sporty and reliable 493 cc ohv (80×93 ) engine which inclined forward in the frame.
Some typical car practice features Briggs used in his design were sump lubrication ( the crankcase was extended to form an oil reservoir holding 3 pints) and return springs within the pushrod tubes to keep the valve gear in constant touch with the cam profiles, giving exceptionally quiet operation.
The Sloper soon got a reputation as a sporting but quiet motorcycle, a real trendsetter.
A new feature for the 1930 model year was the forged steel backbone. A quote from the catalogue:
“A backbone of forged steel- that’s one of the outstanding features of these new B.S.A. O.H.V. models.
Motor cyclists will recognise the significance of this unique feature in motor cycle construction, which means super-strength in one of the most vital parts of the motor cycle – the frame.
It means rigidity – absolute stability on the roughest roads – and greater safety.
There are many other points which will appeal to the motor cyclist. The power-output of the B.S.A. inclined engine ensures a perfect top gear performance, and makes possible the maintenance of high average speeds over long distances without overheating.
The car-type sump system means highly efficient engine lubrication, and economy in oil consumption.
The B.S.A. exhaust system subdues the exhaust note to a pleasant, mellow burble, whilst scientific design has reduced mechanical and valve gear noise to a minimum.
The duplex cradle frame and saddle tank give a low, comfortable riding position, whilst rock-steady steering and efficient internal expanding brakes give a maximum degree of safety at all speeds.”
This Sloper with handsome blue petrol tank and electric lighting is a well-running older restoration.
The former owner has enjoyed it on many runs over the years.