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1974 BSA B50MX 500cc – 1974

The BSA Factory (Birmingham Small Arms) built the B50 in answer to the growing demand for a good 4-stroke off-road bike. The 500cc thumper made a good trail bike, but was too heavy to compete against the modern 2-strokes. Chuck Minert used to race a B50 that was heavily modified with significant success in local motocross and scrambles events. I purchased a new B50 and won the 1975 Dinosaur Run Scrambles, and important 4-stroke only event in the day. I had modified the bike extensively and remember the bike as a blast to ride.

This bike was purchased from a gentleman in New Mexico and comes with a great story. The father of the man I purchased the bike from loved BSA’s, so he purchased two identical 1974 B50’s, one to ride and one to sit in his living-room. The machine you see here was the living room bike, and according to the seller, this bike has never been ridden or started. Kind of the “Holy Grail” of vintage dirt bikes as restoration was not necessary. Please enjoy!

Images are property of The Early Years of Motocross Museum, ®2006