Mike & Christine Salome wrote:
For 4 stroke I/O's:

1. Is it recommended that you change the spark plugs upon winterizing or is
it better to change them in the spring?


I'd change them when they're worn out, a set of plugs should last longer
than a season.



2. How about fuel tank...leave it full w/fuel stabilizer?



I'd lean towards leaving it empty, though it may collect moisture in
some climates. If you leave fuel in it, stabilizer is definitely a good
idea.