R1NGA... Filling to the orange cap has cured my rattle completely, though I wonder whether overfilling in this manner could present a problem, my dealer doesn't seem to think it's a problem though...
So perhaps there's a compromise position somewhere - above the generally accepted upper fill hole, but slightly below the orange 'breather'? The only risk I can see is over-pressure blowing out a seal, unless the Orange Cap really is a proper breather, in which case the risk is oil coming out and potentially getting onto the back tyre.
But if filling to the Orange Cap makes the BB run quiet, then I'd be tempted to run the breather (if indeed that's what it is) into a hose and secure it somewhere other than directly in front of the rear tyre. That way it would be safe. I definitely need to try filling my BB higher and see for myself the results.
