Bad day. After years of flawless performance, my 24 year old 2-stroke Johnson 88SPL idled rough this week. After seeing water on 1 of the plugs, I pulled the head on that side (V4) and found the piston and head damaged. The head gasket had failed. No overheating, t-stats new in the fall, new water pump... what a bummer. After looking into new, I think I'm going to rebuild the engine. It is/was a beast.