I have an 02 zr 500 and I have been having some problems with the idle. After the sled has been run and it is hot, it just about dies when I stop for a minute. Flipping the choke a little makes it worse so it must be a rich problem. I haven't cleaned the carbs yet and I am definitely going to. I can just about gaurantee that cleaning them will cure the problem. My question is - what part of the circuit would cause it to go rich when it gets dirty? I have heard of the pilots getting dirty and causing a lean condition and a poor idle. That situation doesn't seem to match up with my problem though?