BSA 1928 L28 350 cc 1 cyl ohv



BSA   1928  “ L 28”  349 cc ohv  frame # Z 16518 engine # L 6825

The first ohv BSA  is introduced early in 1924.
Its design  is a spin-off from the Hotchkiss engine that powers the BSA light car. 
It  has been designed by Harold Briggs,  a clever technician who has come to Small Heath from the Daimler Works at Coventry. 
Bore and stroke measurements are 72x 85.5 mm, giving a capacity of 349 cc. 
The  hemispherical  iron cylinder head is detachable and has heavy finning.   
The valve gear is enclosed and automatically lubricated. 
A dome-topped aluminium piston with three rings is fitted as well as a roller big end. 
Lubrication is effected  by gravity feed to mechanical pump, then to sight feed on timing case, feeding to crank case. 
The sight feed system  is used because many riders like to see for themselves that the lubrication  system is doing what it should do. 
Many makes use sight feeds and tell-tales till the early  thirties, when “ invisible” lubrication  finally becomes generally accepted. 
For emergency use a hand pump is also fitted.   
The tank holds 1 ½ gallons of petrol and 3 ½ pints of oil.  
The engine develops 13 HP and a top speed of 60 mph is attainable. 
Petrol consumption amounts to 100  mpg and the weight is 220 lb. 
This pleasant vintage OHV sports machine  has been restored some time ago and is a good runner.