Hi guys, my 1999 42' lightning with staggered HP500s is showing 723 on the hour meter, I've had it since 2014, and can't recall how many hours the motors had on them when I bought. I live in Chicago where 3 of the seasons since 2014 the boat was not in the water. Its still running nice and strong, will do 75mph all day long. Wife and I are done having summer babies, so the boat is getting my full attention again. Is there any suggestions on mandatory maintenance I should have done by now?

What has been done to the engines to date?

Check the condition of the bellows. If there are cracks starting to appear in the rubber need to replace all shift bellows and main bellow. That would be my biggest concern.

Impellers!