Originally Posted by RotorHead
Before FB, it was the SA. (1st generation, 12A). The "F" in FB symbolizes "Fuel Injected". All SA motors were "Carburated". In other words, when they came out with the new "Fuel Injected" Rotary (13B), they changed the S in SA, to F. Which made "FB".
I hope I explained it right, but there you go! 
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if thats the case then there was only one model with the FB VIN..