I havent messed with it much yet but that pressure bypass might be something worth looking at. The pressure washer isnt very old maybe 2 years and I dont exactly use it a whole lot. The last time I ran it was before winter. I ran it completely out of gas before I stored it inside out of the cold. The spark plug looks fine to me altho a little wet with oil but that could be from tilting the unit while it was running thinking I needed to work a bubble out of the pump. The head looks easy to get to. I will post how it looks in there when I get around to it.