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Running lean? Why?

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So after a rebuild on my 2005 YZ125 it appears to be running lean... The bike will not start first kick like it used to, It starts a lot easier with the choke on, and the idle seems faster to me, any idea why?

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Thanks for the reply! But I didn't touch any of that during the rebuild... Before the rebuild it ran perfectly, would that really be an issue to consider?

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Sorry I guess I could have been more specific.... I did a top end rebuild only replacing piston, ring and wrist pin. Replacing the old cast piston with a new forged one should matter should it? I did clean the carb, however I'm reluctant to mess with any of the settings because of how perfectly it ran before.

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