I have been running 91 octane because i live in minnesota and the is the only way to get non-ethanol fuel is to buy the premium. Is it ok to run 87 or 89 octane with ethanol in this engine or am I going to see problems with fuel system componants or gumming up my carb??

I would stick with ethanol free. It would probably be ok to run the 87 octane E10, but defiately don't store the boat with any ethanol.

What do you mean "run the 87 octane E10"? Do you mean ok to run 87 octane with 10% ethanol??