My dad has not ran his boat in 3 years, it has been kept in a garage out of the elements. It had fogging oil put into the cylinders after he last put it up, and has been added two the last two years. I hooked a new battery up to it and the starter would barely turn the flywheel. The battery is new and the starter looks good. There is a grinding/rubbing sound coming from the lower unit when I turn the flywheel by hand. I’m thinking it could be the impeller is not allowing the flywheel to turn fast enough. Any ideas?