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Help identifying this engine

That is the engine number the seller gave me and it seemed weird as i was under the impression that they start with CB750 - some number. I didnt find model with series 2120874 as well.
 
No this will not fit the 78. The motor number you have listed is for a dohc motor and the 78 is a sohc motor, they are completely different.
 
X2, I'm pretty much with that too. RCO is a beginning for '79 and later DOHCs, they will NOT fit a SOHC '78 model.
 
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