Well, from your smog report it looks like your motor runs cleaner with more rpm. Which makes sense since it's a small motor. So, there is some sort of emission curve going on there.
Of course if you put a 9" wheel barrow tire on your motor is now going to be spinning about 3 times as fast as with a 27" tire and your motor will certaily be sucking in and blowing out more air than most motors at that mph. If your motor was perfect it would make less pollution the slower it was spinning, but its not. So yeah, sure it can be too small, but I'm not sure how small that would be.
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I <3 forced induction.
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