I am skeptical of the idea that Yamaha tunes their bikes rich.
I know for a fact that their VTwins run lean from the factory...for emissions reasons. One of the first thing that Warrior owners commonly do is to go into the diagnostic mode in the dash and tune each cylinder to be a little richer.
So....can anyone actually substantiate the claim that Yami is tuning bikes rich? Because of the effects of a rich mixture on emissions output...I HIGHLY doubt this is the case.
I will now await proof. Either a Yamaha Tech Bulletin or a Dyno run with A/F on a stock yamaha would be proof enough.
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