OK...Decided to work on my YZ400F today and my goal was to find out where this oil leak was coming from and fix it. It wound up that it was coming from the crank case cover. To fix this I took it off and siliconed it. It seems to have solved the problem but I have heard that this is a bad thing and there should be no oil in there. What do I do? Is this okay or am I going to do damage like this?