Why does my 225 run so rough cold?

Ruadhd2 said

This is good stuff. The carburetor is brand new. So where do I look first?

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Brand new as in never ever used before, new old stock? Or "brand new" as in a "remanufactured" item from a parts store? If the latter, it's probably part of your problem; "remanufactured" carburetors are junk.