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Originally Posted by ironhead1530
ok... I read somewhere that it could me that the mixture is either too rich or too lean. Is that right?
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It's from leaving the choke on too long while idling which causes a rich mixture to burn in the pipes. Getting it out is hard work. On my 650 the previous owner caused the bluing and I tried Blue Job but gave up after a couple of hours. As WW said...it's a sign the bike is used.
