| 摘要 |
PROBLEM TO BE SOLVED: To reduce noise of an engine at on-shore racing time. SOLUTION: A control means is provided for changing a maximum engine speed X1 of the engine 6 according to an operation state of the engine 6, and the engine 6 is operated in an optimal state according to a difference in the operation state of the engine 6, for example, a difference between an on-shore racing state and a planing state.
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