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Update:
Local mechanic said to send injectors for cleaning to a place named Brucato. Came back with 5 bad air injectors and one questionable fuel injector. Ordered 5 new air injectors and installed....

Totally forgot the engine serial! 1B788229.

Update. Plugs changed again. New coil arrived and I put it in place of each coil with no change across the board... still same issue. Belt tensioner is...

I replaced all plug wires just for good measure. Put the test light on all coil to plug links last night and all 6 were the same to me. Took the boat over to the lake to see if it helped and I still...

Thanks guys! I picked up a spark test light this evening and will try it out as soon as I can. I also went ahead and ordered a single coil and I plug wire so I can try to isolate my issues.

My 2010 Optimax 150 (only 156 hours!) has lost power through the powerband. Prior to, I could run approximately 5800 rpm at about 62mph. All at once, my top end is maxed at 5000-5100 rpm and top...