Any decent welder can add an O2 bung to those, or better yet send them back to CMI and they’ll do it for you, and then install a wideband. It’ll save you years of grief and highly likely an engine.

I didn't even think of doing that, if I end up keeping the boat through next season I may very well do this over the winter. Would be good to have them inspected and pressure tested anyway.


I haven't messed with them yet. It is a 4 corner adjustment, so I considered taking maybe 1/4 turn in all the way around and see what happens.