My dad has been using citrix acid for years with similar results. When i had my 200m, I tried the vinegar, but it went everywhere. So many pin holes! Had to weld and epoxy. <- I only owned an arc welder at the time lol
I went with a JB weld thinned down with acetone. Got it very very running, then sloshed it around the tank until it sealed all the holes. Never leaked when i owned it. Took it to the dunes and all kinds of run stuff.
I've also seen videos of electrolysis being used to remove the rust. It does awesome work took from what i've seen.
I just wanna go fast. If your not first, your last!!
Reproducing the Tecate CDI. Contact me if you need one. I'm most accessible on FaceBook. You can find me on the 1984-1987 Kawasaki Tecate KXT250 Group.