Thanks all for your replies.
The froth is just lots of bubbles in the oil when the dip stick is removed from the frame top tube come oil tank. I'm sure it didn't used to do this - maybe I'm riding it harder.
As no one has replies ' Oh my GOD, it's about to explode etc, I'm not going to worry about it.
I've never opened the air blead screw on the oil filter housing, though I sometimes wonder if I should. After an oil change I start the bike with the oil filler cap / dip stick removed and watch the level drop, and add the last 0.2 or 0.3 litre of oil.
I assume that the level wouldn't drop if their was an air lock.
Mark
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