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Extremely low compression in two side-by-side cylinders can be caused by several factors, including worn piston rings, damaged cylinder walls, or faulty valves that fail to seal properly. Additionally, a blown head gasket can allow coolant or oil to enter the combustion chamber, leading to compression loss. Other potential issues include improper timing or a malfunctioning ignition system. Regular maintenance and diagnostics can help identify and resolve these issues.

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2w ago

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