I don't like downtime - so I do some preventative maintenance before putting in for the first time. I ALWAYS replace the impeller (my luck it will fail on 4th of July weekend) and check the timing. Since my boat is 3 yrs old - I'm having a complete tuneup (plugs, wires, cap, etc) and possibly a new belt. The rudder should be greased (if your dealer didn't do it) and I've heard that it is a good idea to lube the starter. Good luck!!