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You sure the brown junk in the tank isn't residue from old gasoline? I've had a couple that got like that, and at first I thought it was rust. Lacquer thinner will probably get soften it if it's residue/varnish, but I usually have to put some small gravel in and shake it around off and on for a day or two.
The green gas in carbs has always been a signal that they need a very thorough disassembly and cleaning when I've come across it.
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