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Recently I realized that this 90 HP engine was running on 3, it was the low left cylinder that fired but did not run. Had the carburetors cleaned, ran fine. For three days. Same cylinder did not run. Had the carbs cleaned and a filter installed. Ran fine, for 4 days. Again as before. Runs on three and pushes the boat (6m, 700kg, open cruiser) well over 30 knots at 5500 rpm, but burns a lot of fuel. And runs on three. What could I try to make it run and keep running ?