| sorry, only just seen your reply (didn't show up on 'todays posts' ).
Well the air filter is now lovely and clean and it still does it, to a lesser extent though.
i think the post on the 996/998 forum (*) is closer to the mark. That suggested the oil breather in the top/back of the crankcase gets a bit clogged and stops the oil returning to the crankcase.
(I think, might have been elsewhere).
It is an odd one. The bike runs great and has loads of compression, just breaths a little.
Thanks for the thought though. |