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crf450 smoke

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I have a2008 crf450 and when I first start it puts out a lil smoke but once it gets warmed up to operating temp it dosnt do it all anymore . and it has a newer top end on it with new valveseals piston rings etc. is this normal for crfs

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Sounds like the rings aren't seated properly (cylinder out or spec and/or not properly prepped prior to installing the new piston OR improper break-in procedure) or leaking valve stem seals.

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How much is alittle? A puff or two when you first start it seems to be the norm for all CRF's

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Mine doesn't smoke at all. Puff on startup is typically valve stem seal.

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