Chiron, you have the correct understanding. We think the batching is caused by the inflow of engine cooling water getting ahead of the engine's ability to keep it moving continuously through the exhaust system with the exhaust. In this scenario, the buildup of water sequentially builds up a small amount of additional head which the engine sees as a slight net increase in total exhaust back pressure as it "batches" the water out of the back of the boat.
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