I have a 1990 600R Ninja. I am rebuilding the fuel valve (petcock) because it leaks. The problem I am having is that my valve has a piece between the diaphragm and the diaphragm cover. All the parts diagrams that I can find does not have this piece. I looked at all the years from '88 to '95 which have my style of valve and they are all the same. Does anybody know of who the hell I can talk to about this. My local dealer closes before I get off work and I can not talk to them. Thanks.