You don't need much pressure at all. Take spark plugs out, ground your wires, turn engine over while blowing compressed air into the cylinders. Many rags are usually used. Use new spark plugs, pour 2 stroke or fog oil down holes if not using for a while. No wd-40.
JS550 87 flooded with water.
Filled the engine with water by using onshore cooling system. I checked the water jacket and the head seals doesnt seem to be any leaks is there spec for how much pressure to put on the hose while running off shore????
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