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Please be more specific regarding the "problems".

If the engine knocks at red line, you probably have a worn bearing or piston slap.

If the engine won't REACH red line, you may not have sufficient fuel/air mixture reaching the cylinders to allow the engine to run that fast.

Understand that "red line" is a MAXIMUM RECOMMENDED RPM of a specific engine. The engineers have calculated the mass and strength of internal parts and determined that the engine should not be allowed to operate at RPM's ABOVE the red line on the tach.

It doesn't necessarily mean that the engine should be operated at that speed.

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15y ago

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