A mates pulsar has had orangey water in the radiator for a while now, so thought it may have been something to worry about. Just to make sure we flushed the radiator through and refilled it with water again and after running for a few minutes would turn orange again. The car works perfect and has been like this for a while now and i did a compression test which came back perfect at 150psi across all four. Has he got anything to worry about?