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'85 XR100 Too rich?

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I have a '85 XR100 that doesn't seem too 'stable' (my best impression) when my son is putting around the yard at low rpm and puffs a bit of blue smoke. When I ride it and open it wide, it really gets up and goes without missing or hesitating at all. Also, the mixture screw didn't seem to to a whole lot when I adjusted it.

Am I right that the mixture screw is for idle and the jets are for off-idle?

Other than the teardown and cleanout of all the ports are there any other ideas out there?

Thanks,

Todd

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