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6 Dec 2016

Question about English (US)

What does When 1/4 inch away from the bore, flare the relief out slightly to radius into the opening. mean?

It's a sentence from a manual of motorcycle. I especially don't understand what "radius" indicates in this sentence, as I'm not that sure about the meaning of "flare...out", too.
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  • English (US)

  • Japanese
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