Hi all, Im new to the boating scene, and bought a Swiftcraft half cabin with a Yamaha 80hp 2-stroke outboard. Its had a few problems then it started running on 2 cylinders. Had a quick check and found the lower cylinder had water contamination which was leaning the mixture out and stopped it firing until the revs picked up. Removed the cylinder head, found it was spotless clean, like it had been power washed. Cant see any obvious issues with the head or gasket. Can anyone on here give me some direction as what route to take, or anywhere else to check for the water getting into the cylinder? Thanks in advance!!