Water in cylinder

[billm]

3.0 liter found water in #4 cy

3.0 liter found water in #4 cylinder what should i look at? compression test was good #1 150 #2 155#3 130#4 155

 

[Bt Doctur]

hole in the exaust riser or a

hole in the exaust riser or a leaking riser gasket