Mine smoked a fair bit when I re-actvated it recently. I thought it might be an unsuccessful re-fastening of the exhaust flange, but it stopped after a few k so that seems to be OK so far..
I'd treated the outside of the pipe with aluminium and sunflower oil so that was probably it cooking off. Quite likely a complete waste of time but since I had the pipe off anyway I thought I'd try it.
Also crumpled a beercan inside the downpipe, which I've done before, That doesn't seem to smoke much but I suppose some paint/coating must burn off.
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