On Wed, 16 Jan 2013 15:12:01 -0800 (PST), Tim
wrote:

I've known of people who have taken the prop off the lower and put it
in a large vat (55 gal drum cut in half) , put the lower in it an run
the engine which gives the engine a total flush of water, but that
takes a lot of antifreeze and storing is a problem and it's a messy
set up.... but it works.

===

You can do it with a lot less antifreeze by using a set of "muffs" to
gravity feed right into the intake holes on the I/O leg. You just
need to rig up a jerry jug and some hoses.