Power loss over 3,500 RPM 1987 Yamaha 175 ETLH

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Mar 1, 2015
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The boat shoots out of the hole and after planing out, the motor has intermittent power loss when running above 3,500 RPM. It kicks in and out like it's losing a cylinder. I have changed half the coils with no success. What else could it be? Thank you.
 
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