Thanks there is so little out there on these motors mine is a 1928 but scream’s 29 Throttle handle’ Silent exhaust And 29 carbs Coils to. All matching numbers on case 2. Serial number 10673 .an assuming this model number is 82 B an not Standing for 3 .1928 ( 094 pistonsb And bronze rodsThink it was first edition of racing versionThanks Joe