Mine looks to be 1/2″ all the way through.
I’ve been looking at some you tube videos that
show the exhaust housing when they are running
and the ones I have found don’t put out the water
through the holes that my mark 7 does. I checked
the cylinder temperature when it was running and
it was in the mid to high 90’s and the water temp.
in my tank was 85. I remember checking the
exhaust housing too and it was way higher but
I don’t recall what it was. I had another lighting
6 years ago. Replaced the coils, condensers, all
the seals, and it needed a prop. I ran the motor a
lot the next summer and then passed it on. I cant
remember how much water came out of the holes
on that one. The coils and condensers in this one
look resent. They have been replaced anyway.
Although the holes were open there was a
considerable amount of carbon build up in the
exhaust housing. Maybe all that carbon was
keeping the water from exiting the holes. If this
motor has ever been apart its been a long time
ago. I need to get gaskets and replace all the
seals. I think I’ll set it aside and save it for
something to keep me busy this winter. Thank
you to all that responded. Its very much
appreciated.
Tubs
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.