| 摘要 |
The weight of the first and fifth counterweights, which are located at opposite ends of a crankshaft, are set to be equal to or smaller than the weight of the remaining second to fourth counterweights. In addition, the thickness of the first and fifth counterweights are set to be equal to or smaller than the thickness of the remaining second to fourth counterweights. Moreover, the first to fifth counterweights are formed generally the same in configuration.
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