This is my 7.5hp, but same concept. Under the flywheel/magplate you will see a roller riding on a 1/2 moon. I.believe u want it to ride as far left when fully advanced without going off the plate. On the start position it should just barely touch on the plate.
Is the motor original to the boat? You may have lost a 8th of a inch off the prop without knowing it. A prop shop should be able to tell you and recommend the proper pitch for tour boat.
Both plugs firing and looking ok? You can get a bad condenser.
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