Re: Upper Bellow on Mercruiser 260
I'm assuming you are talking about the hoses that attach the exhaust elbow to the riser and Y pipe, and not the ujoint bellows that I think NHGuy is referring to.
IF that is the case, normally you can remove remove all the clamps. Push the lower hose down onto the Y pipe, then slide the elbow and upper hose off the riser. If things don't work out, just remove the riser and install a new gasket. Depending on the year of your "260 Mercuriser", you might also check the exhust shutters in the top of the Y pipe while you are in there. If your model has them there.