If you ever need to top up your coolant on the GTR it is a real pain because to access the header tank panels have to be removed just so you can undo the top and fill. A great bit of design Mr Kawasaki! However there is another way. Go round to the right hand side of the bike look through the fairing slots and you will see the radiator cap. You can't get that off either. Any way just below he cap are two pipes undo clip on top one and pull off its spigot(is that the right word). Now get a fork syringe or similar with tube on end and put into pipe you have taken off. Fill syringe with coolant and push plunger down it will go straight down that pipe into header tank. When finished replace tube on spigot and ride into sunset. ONLY DO THIS WHEN ENGINE IS STONE COLD.