Are these parts salvageable?

If you buy 5 gallons of.evaporust, you should have enough for the rest of your life. It isn't one time use. Keep using it until it doesn't work anymore.
I’m not even sure 5 gallons would be enough to cover my tank in a big enough pail…
 
Heavy acids (even vinegar) are going to leave you with a minty clean tank... And (read that as but) that will flash rust and rot out on you very quickly.

Evaporust.

And take a stainless brush to the exhaust.
Evaporust will also flash rust too won’t it?
 
At this point you have little to lose if they don't turn out usable. The best value is education should you need to restore something of greater value in the future.

For the tank, if it doesn't have any holes, remove the surface rust and prime with a rust converter. Then filler primer and finish coat. The filler will likely be shot and if a cheap replacement can't be found off a bashed tank make the thing into a piggy bank or lamp base.

Re the pipes, Brush, sand or scrub in an inconspicuous area, I'm guessing the exhaust tip, and see what happens.

The end product is what YOU want. If it works and you're happy with it, ride on.
 
Interesting. I just realized the muffler completely disappeared in the fire! It was mounted on the pipes beforehand.
Carbon or aluminum? The muffler isn't completely gone. It has the expansion tube. It has lost the outer shell and packing.
 
Carbon or aluminum? The muffler isn't completely gone. It has the expansion tube. It has lost the outer shell and packing.
Ah OK. Aluminum I assume?

Here’s a (low res, sorry) pic of the bike in happier times.IMG_3538.jpeg

At this point I was just trying to source mirrors and side maintenance panels (PO had fabricated some out of sheet metal and fastened with a motley assortment of wood screws, drywall screws and probably chewing gum) and she would have been good.
 
Ah OK. Aluminum I assume?

Here’s a (low res, sorry) pic of the bike in happier times.View attachment 71250

At this point I was just trying to source mirrors and side maintenance panels (PO had fabricated some out of sheet metal and fastened with a motley assortment of wood screws, drywall screws and probably chewing gum) and she would have been good.
Looks aluminum. If it was round, you might be able to get a new aluminum, carbon or stainless tube and rebuild it. Probably more cost and trouble than buying a complete slip-on muffler though.
 
Start with that wire wheel on your drill.
 
Evaporust converts the red oxide to black oxide. It's like blueing or parkerizing.
The acid changes the molecular composition of the rust (I think it liberates oxygen)
It's called passivation and the stronger the acid the stronger the reaction.
I use muriatic acid, it's about 10% of the price of fancy dancy "cleaners"
 
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