The recommended compression ratio for a 1991 Rotax 377 engine typically ranges from 6.5:1 to 7.5:1. It's important to ensure that the compression is within this range for optimal performance and efficiency. If you're experiencing issues, checking for proper sealing of the head gasket and the condition of the piston rings can help maintain appropriate compression levels. Always refer to the manufacturer's specifications for the most accurate information.
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