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Thanks for this. I don't think I have a compression ring problem (but a compression test will confirm one way or the other) as there is no fuming at all coming from the crankcase breather hose - that's the one that connects to the rocker cover. Any 'blow-by' from weak rings would (in my view)...

I have a 1972 CB750 that has developed an issue where I am losing oil out the oil tank breather. All hoses have been removed and are clear to breathe through. All hoses are connected as per the workshop manual - i.e. crankcase breather correctly connected and clear, the small hose from the...