2006 90 hp 4 stroke power loss

[GeauxJoe]

I have a 2006 Yamaha 90 hp 4 stroke motor that bogs down and loses power after a few minutes of running. Starts fine, idles and no wake speed runs fine. I’ve changed the plugs and fuel already. Looking for advice on what the problem could be

[99yam40]

do you have have gauges that will tell you when you have an overheat or low oil pressure?
does you alarm system work or at least the buzzer?

[GeauxJoe]

I do have the low oil and overheat lights but haven’t tried to test them, just assume that they should work.

[99yam40]

could be over heat.
test the alarms/lights to see if they work