After replacing the cap on the overflow tank of my Lazer 27hp Kawi I thought I solved my leaking problem. Now a month later the level of antifreeze in my tank has dropped one half inch. While this is not a great amount, is it normal? I mow very rough terrain and I'm sure splashing is a problem. The area around the cap does show wetness, but not actual drops running out of the tank. Just want to know if this is normal, and if not what is the solution.