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The barrel flange is one of the major differences with the 850 Commando motor. The first Atlas which came to Melboune had it's barrel flange break off. That was the reason they did not sell. But the Atlas which Bob Rosenthal raced in A grade, did not develop that problem. I always thought that Norton twin motor development stopped at the Atlas.. It is interesting that the Matchless version might have been better. The Commando motor was changed to get smoother running - it worked. But an Atlas was a more serious motorcycle. When the Atlas arrived, there were 3 motorcycles - the 650cc Super Rocket BSA, the 650cc Triumph Bonneville and the 750cc Atlas.

[QUOTE="acotrel, post: 650316, member: 4295"] The barrel flange is one of the major differences with the 850 Commando motor. The first Atlas which came to Melboune had it's barrel flange break off. That was the reason they did not sell. But the Atlas which Bob Rosenthal raced in A grade, did not develop that problem. I always thought that Norton twin motor development stopped at the Atlas.. It is interesting that the Matchless version might have been better. The Commando motor was changed to get smoother running - it worked. But an Atlas was a more serious motorcycle. When the Atlas arrived, there were 3 motorcycles - the 650cc Super Rocket BSA, the 650cc Triumph Bonneville and the 750cc Atlas. [/QUOTE]