A F3 motor will be the easiest swap by far. A 900RR motor will go, but you have to make/weld a lower motor mount to the frame down by the swingarm pivot. Ive never liked seeing this done because Of the heating of the steel frame near the swingarm pivot. But its been dont and apparantly is fine. Ive never heard or seen a FI bike put into a f2 or f3 frame. That my friend would be cool as hell!!!

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1998 CBR F3