If you think the bad gas just clogged the passages and jets, you may not need a rebuild kit. Usually the rebuild kit have new seals and gaskets (sometimes even new throttle rods). As long as you don't tear the main gasket you shouldn't need a rebuild kit (for the new carb). A few things I have learned (some the hard way):
1. The jet are brass. make sure you use a good square screwdriver that fits perfectly (grind a screwdriver down if necessary). Use good even pressure and don't over do it IF you are going to attempt to remove them. The ones for the old zeinth models can be acquired still but they are about $20 a piece after shipping and take a bit of leg work to get them. Email me if you need to replace one.
2. Remove all external screws BEFORE splitting the carburetor. I bent the main jet screw on a Marvel for an 8N b/c I didn't realize that it went through both halves. I was still able to get the carb working long enough but that was another $25 part.
3. Make sure you look down ALL the passages for clogged jets. I had to take that same marvel mentioned in number #2 apart 3 different time until I found the main jet (that happened to be the one that was clogged).
4. Go buy some 17-25# nylon test line fishing line and some nylon weed trimmer line. They are stiff enough to pass through all the passages to check if they are clear, yet they won't damage the brass passages and orifices when trying to clear them. White line will turn dirty too if the passage still has junk in it.
5. In addition to cans of carburetor cleaner, use and air compressor to help blow the passages clear.
6. Check all the screens first. There should be one in the sediment bowl, and my B has one inside the carb attached to the fuel line elbow. Reading about Red-Kote, if it is not perfectly dry it forms strings or flecks in the gas. These are possibly what are clogging the fuel filter AND the carburetor passages (possibly your injectors, but I would still replace the filter first and see if you can get it going). If it does help for a bit, you may have to change the fuel filter a few times until you get all the particles flushed out. If it is just the case of tiny particles clogging filters your situation may be better than you think.
As for the gas tank, it appears, acetone, Methyl Ethyl Ketone, or paint thinner will all soften and possibly dissolve Red-Kote. Some people also sell strippers for old gas tank liners. There might be other chemicals that would remove any old coating. Finally you could try splitting the tank so you could clean it better.
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