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The problem with overfilling isn't primarily that it's dangerous, it's that the overflow can overwhelm the carbon cannister that is used to help emissions (at least on CA bikes, not sure if the rest of you all have one as well). The canister works fine for vapors, and eventually burns off enough under normal use to last the life of the bike. However, if it fills up with liquid gasoline, it causes venting problems, making for hard starting and even general engine performance issues.
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