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When did the engine ingest water?
Was it running?
Its been sitting with the water in it?
Ok, drain the oil from the engine. Fill with new oil, remove the spark plugs and then crank the engine over to get the water out of the cylinders. Replace the plugs, then try and start the engine. Allow it to warm up, stop it and drain the oil again. You will also need several oil filters. After draining it this time. Use diesel fuel, and fill the crankcase to operating level. Start the engine for a few minutes. Do not rev it up. Stop the engine and drain the diesel out of it. Add fresh oil once again. Run the engine to get it up to temp again. Stop it and drain that oil, to remove any of the left over diesel from the crankcase. Add fresh oil again. Run the engine for a bit. Stop the engine and check the oil for water. It should be clear now.
Is yours the two or four stroke engine.
I wrote the earlier for a four stroke engine. On a two stroke, you can dump the remove oil tank, disconnect and blow out all of the oil lines on the engine. Replace the small filters, refill the tank, and them bleed the oil pump. If you have already removed the plugs and cranked the engine over to remove the water from the cylinders, and make sure that there is no water in the fuel or the carbs, start the engine and allow it to warm up. This will boil the water from the block and get it all out.
Front of the engine.
Yes for water. Start the engine, then turn the water on. Leave it on as long as the engine is running. Turn the water off, before stopping the engine. Have to treat these engines just like a jet ski.