We have two cr85r's.I did a top end about 5 weeks ago.Everything was running fine.About 3 weeks ago coolant started leaking out while my son was riding could'nt tell where it was coming from.After cleaning the bike to see where it is coming from i found it.It comes out of the over flow tube.I have change the cap and put on another head gasket,with no luck.Today i started the top end on the other bike and thought i will switch the radiators to see what happens.After it warms up it blows out of the overflow hose.As long as you don't rev it up it is fine.Also checked the water pump forgot to mention that.Coolant isn't going anywhere else just out of the over flow Any ideas would be helpful Thank