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Normal compression for a 25 hp 2-stroke Mercury outboard engine typically ranges between 90 to 130 psi per cylinder, depending on the specific model and its condition. It's important to ensure that both cylinders have similar compression readings for optimal performance. If compression is significantly lower in one cylinder compared to the other, it may indicate issues such as worn rings or a blown head gasket. Regular maintenance and checks can help maintain proper compression levels.

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