None of my boats have ever been "completely" dry.

I would see if the dealer will check and adjust the valve lash.

Maintenance records available and/or being provided? Oil change (all 3)/Spark plugs/Cap and rotor/Wires/Impellers (cooling system and ballast) . Just standard maintenance things that may or may not need to be done. Would be nice to know so you aren't throwing money at it.

Also make sure everything else works, ballast, stereo, bilge pump, etc.