I checked the alignement and the cutlas bearing at the end of the season last year and all is well.
Jim, I've got to know...what would I be looking for inside under the exhaust flap? A mouse nest perhaps?
Thanks for all the ideas guys.
Current update - I'm out of time.
I dropped it off at the local Bu dealer the only shop in town with a mechanic that knows Indmars well.. Their mechanic has been working there for 15+ years back when the dealership sold MCs. Being the middle of August I can't go two summers with a boat not in full operation. We're missing good valuable time on the water tinkering and testing in between a busy schedule. I'll keep you posted on the diagnosis.