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Do fuel injected bikes have O2 sensors both pre and post cat?
The OP is a mile high, and my understanding was that the bikes have static fuel maps that don't adjust to changing air density.
Another question is what octane fuel is being used? Plenty of people report unburned fuel smell when they use premium fuel in a bike not designed for premium. I run regular in my CBR600, because that's what it was designed for.
As far as reasoning for adding a cat to a motorcycle, smog is a local problem. If the locality does not suffer a smog problem then I see no reason to get poorer fuel economy and higher CO2 emissions to reduce a local and short-lived pollutant that isn't a problem.
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