Hi again everyone, I did a running commentary on my rebuild a couple of years ago and got a long way towards getting the old Z13 A1 running again. All the posts stopped because of other projects and work commitments demanding my time. The old 13 went back into a dark corner of the garage until now. I am back on it and have just started it for the first time in 11 years. It started first flick although I had primed the cylinders with a few cc’s of petrol through the plug holes. The noise it makes is fantastic. It was run without the cooling system attached so that I could be sure that all the down pipes were seated properly-which they were. I am now praying that the water pump is ok and that the valve guide oil seals still function properly. Mechanically the engine is sweet and is very quiet with regard to all the bits flailing around inside. I have just one problem; the radiator cap is finished and I cannot find one for love nor money, does anyone know where said beast can be obtained or, failing that, whether a cap from something else can be used? Cheers Marc.