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135 to 160 most important thing is that they are all less than 5 psi difference

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16y ago

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What is compression on 1975 70 hp evinrude outboard?

Compression on a 1975 70 hp Evinrude outboard refers to the pressure generated within the engine's cylinders during the compression stroke, which is crucial for efficient combustion. Typically, compression readings for this model should be between 90 to 120 psi. Low compression can indicate issues such as worn piston rings, damaged cylinder walls, or valve problems, which can affect engine performance and reliability. Regular compression testing is essential for maintaining the health of the outboard motor.


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What should the compression be on a 1984 70 hp evinrude?

The compression for a 1984 70 hp Evinrude outboard motor should typically be between 100 and 130 psi per cylinder. It's important that the compression is relatively consistent across all cylinders, with no more than a 10% variance between them. If the compression is significantly lower than this range, it may indicate issues such as worn rings, damaged pistons, or other mechanical problems. Always refer to the specific service manual for your model for the most accurate specifications.


What is the oil to gas ratio for a 1975 evinrude 70 hp outboard motor?

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What is fuel mix for the 1981 model 70hp evinrude outboard motor?

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What is the torque on the cylinder head on a 1986 Evinrude 70 hp motor?

The torque specification for the cylinder head on a 1986 Evinrude 70 hp motor is typically around 25 to 30 foot-pounds (ft-lbs). It's crucial to follow a specific torque sequence for even pressure distribution. Always refer to the service manual for the exact specifications and procedures to ensure proper installation.