I have just bought wr 400f ‘2000 and it is may first motor. I was so happy and proud of may WR until last week. Then I experienced some problems with starting. At the beginning I thought that I do not know how to do it properly, but there was something else what disturbed me – it was very easy “to kick”, what probably means that there is problem with compression. When I was looking for source of problem I noticed that there was no cooling fluid in radiator. I do not have any idea what happened with this fluid (the oil level is OK). Could you tell me which parts I have (probably) to replace? I would like to ask you for advice where (in USA) I can buy this parts for reasonable price, because here in Poland motorbikes and parts are very expensive (for example Yamaha wr 250f ‘2005 costs about 11 500$). Any comments or suggestions are very welcome.