On Fri, 28 Sep 2007 13:23:53 -0700, Diego wrote:

I have a boat with twin 350 hp Crusader gas engines. I would like to
cruise this boat between Florida and the Bahamas. It will be optimal
for me to cross the Gulf Stream at high cruising speeds to get out of
harms way, then reduce to a very slow speed when moving around the
islands in order to conserve fuel and increase my range. I've heard
that this can cause fouling of spark plugs. Has anyone tried this and
can comment on doing something like this? Does the plug fouling
happen over a lengthy period of time (weeks) or rather quickly (hours)?

I had the same engines in my old Bertram 33. It is not a problem. We
did hundreds of miles of canal cruising at slow speed with no issues
at all.