Hey,<br />I have a Chrysler 135 outboard (which I have yet to start).. testing the compression by cranking by spanner with the plugs out/finger in.. indicates a good push/pull on pots 1,2&3 but bugger all on the 4th piston.. what's the chances it's just a gasket? would rings cause this on an outboard typically? Hole in the piston top? just fishin for some common causes and maybe better checks to do before(in place of) stripping her down..<br />Never know, maybe it's a common complaint and easily fixed..<br />AJ