1971 BSA B50MX
Frame no. JE1572
Engine no. B50MXJE15728
The BSA B50 was introduced in 1971 as the largest itineration of BSA's four-stoke single that was originally introduced in 1958 in the 250cc C15 Star. The B50MX turned out to be the last competition motorcycle announced by BSA, just as the company's efforts came to a close. Be aware that the closure was no reflection on the quality or design of this BSA as company histories have pointed out. As it happened, the B50MX had been developed through the great success of the works machines in motocross, using bikes based on the B44 Victor, predecessor of this design. The result was that the full-500cc B50 had a strong and powerful engine, honed by much development. This was mounted in a completely new chassis with an oil-bearing frame (OIF), new so-called slimline forks and new brakes. With the beautifully tucked-in exhaust and good riding position, this made for a fine competition 'crosser of which, sadly, relatively few were made.
This example appears to be in basically un-molested and original condition, a rare thing in a competition off-roader but it does have an aftermarket Boyesen electronic ignition installed. Sold on a Bill of Sale.
- Please note that the complete frame number for this motorcycle is JE15728.