You know what I think it might be, that i had similar issues with. Possibly you have the injector connected to the wrong one or o2 sensor connected wrong. Doing this wont throw a check engine code but would make it run rich because the computer is reading the wrong cylinders.
If you look at the injector wires and o2 wires they have a code writen on them that specifies which cylinder that they are suppose to be on. (pretty snazzy in case wires go everywhere)
I feel that is your issue.
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1990 250F. ex300 motor swap, 15/42 gearing, flush side markers, newgen intergrated front fairing, rear integrated turn signals, DB Touring Bubble, zx600 rear shock, Custom DanMoto Exhaust
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