Petcock issue.

[spldart]

There is a post that contains the line 'quote'
"if yours still leaks and you don't want to spend $80 on a new one, you can get one from a Suzuki LT80 or KFX80 for around $18. It is not vacuum operated, but it has the same mounts and gasket shape and tubes with reserve, so you just mechanically shut off the fuel when parking the bike and plug the vacuum line to the carb."

I tried this...

I had to bend the flange at the bottom of the tank the handle for the valve overlaps the same flange you have to bend to clear a screw.
It's not a good fit but it does work.
Just saying.....