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Signs of being lean vs. rich?

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What are signs while riding that your bike is running lean? Along the same lines, what are signs that your bike is running rich? Thanks in advance.

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the easiest way to tell is take note of what happens with engine temp.if the bike runs better warm but still not right its lean.if the bike runs better cold and worse as it warms up your rich.

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i have changed the stock main jet from 105 110 but cant seem to find anywhere that sells different size pilot jets can anyone help also is this neccessary to change the pilot as well as the main i am a complete novice and am trying to sort out my sons bike which was running ok till we changed the stock air filter for a bbr filter and then changed the exhaust to a two brothers exhaust which caused the bike to have "flat spots" when accelorating since changing the main jet which i was advised would sort the problem it has actually got worse can anyone help PLEASE!!

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