I suppose the obvious point is that if you are over-riding the O2 sensor, but not having the bike properly set up I.e. with a power commander or similar, then the engine air fuel ratio is likely to be out, probably resulting in an even more lean state than usual. I say this as replacement cans may typically flow more air than the standard ones. The alternative would be just to unclip the O2 wiring connector and then either put up with the F.I warning light or else remove the trigger pin wire to the ECU.
I'll stand corrected, I'm no expert, but I think that's a fairly common sense conclusion?