yamaha 200 4 stroke idle overheat need help

[finchaser]

I have an 02 200txra 4 stroke that overheats only at idle.
2 mechanics have informed me that my anodes have played out and i need an exhaust port etc. Adding up to 4200.00 i'm wondering what options i have, rebuilt etc. Can i get parts? Does someone have a reasonable rebuild for this problem thanks in advance for your help.
CAN BLOCK STOP LEAK BE USED IN AN OUTBOARD TO BUY MORE TIME? BAD IDEA?

[rodbolt17]

depends on what part corroded.
NO one will KNOW until its dissasembled on the bench.
takes about 3-4 hours to lay it on the bench.
until then its all guess's in the wind.