Chain is only a few months old and I do lube it often. Did have some time today though so cleaned it nicely and relubed, so will see. I also found that the left fairing piece had a broken tab inside (I was told it had a minor tip over some years back) so sorting that out with copious amounts of epoxy. It looks like the radiator touches the fairings on either side (has small rubber stops in place), so I recon there is probably loads of places the rattle could be coming from.
2008 Z1000 Black, 54K Kms, Michellen Road 4 (front & back), BMC air filter, Integrated tail light, shorty levers.