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03 crf 450 running rich?

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Hi all I got my bike rebuilt bout 6 months ago and it has been blowing a little bit of black smoke (fuel) once it is revved hard. It starts fine and runs good but uses engine oil and im not sure why! would this make it use engine oil as well??

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Running rich can cause excessive oil burning. Excessive hydrocarbons (fuel) can wash the oil film out of your cylinder. I suppose it could also lead to premature ring / piston wear too.

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thanks for the info i will check next ride to see if oil is draining into trans side and if not i know it will be this problem (running rich).cheers

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