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That is a 270 drive AQ130 is the engine model just so you know when you go to look up part numbers.
Well, looking at the obvious....it is, more than likely, either something mechanical sticking intermittently or...it is something like a sensor going
New PDS bearing, seals and crosses (u-joints) What condition is the pilot bearing for the PDS in the flywheel, is the damper plate in good condition?
I have never looked in the spark plug hole. But I have seen chunks of carbon fall out the exhaust after a treatment. That motor had a ton of carbon build
We'll be putting the engine back in soon. Before the boat was disassembled, I had rebuilt the carbs, fuel pump, and water pump to get the engine running