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For the record I couldn't unscrew the canister but decided it wasn't worthwhile anyway. The whole system was clear of oil and there were just a few drops of moisture in the black plastic tank. No residual evidence of any dirty air having got to the airbox and left deposits; the top of the reed valve that I could see was a nice shiny brass colour.
So presumably all good therefore I need to look elsewhere for the explanation of excessive oil consumption.
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