"John H" wrote in message
...
My Mercruiser 350 normally gets a spring tune up, i.e. new plugs,
timing, etc, etc. Are new plugs necessary every year? What *must* be
done every spring. All the fluids were changed in the fall, and the
batteries were kept on a charger most of the winter.

Don't forget about the plug wires, hoses and clamps. If they look slightly
worn of cracked replace them.

Bert