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For a 2004 four-stroke Mercury outboard engine, the compression should typically be around 120 to 150 psi per cylinder, depending on the specific model. It's essential to ensure that the compression readings are consistent across all cylinders, ideally within 10% of each other. If compression is significantly lower in any cylinder, it can indicate issues such as worn rings or valve problems. Regular maintenance and checks can help maintain optimal engine performance.
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