932 amal carb and the FNG

Those shiny brown-black globules in the intake walls are the result of alcohol dissolving resin in the gas tank. I have seen this several times over at my local Norton shop - with plain fiberglass tanks and coated fiberglass and steel tanks. Two of the bikes were Nortons - a '72 Interstate and '71 Roadster - one was Triumph T150 with a coated tank (sealing done by a PO, so source was unknown), and one was a '67 BSA Spitfire with the little glass tank. I've also seen a half dozen Nortons with coated tanks and VERY iffy insides.

All of these had the same symptoms - rough running, fouling plugs, sticking slides. Only solution seems to be a steel tank and a good soaking of the affected parts in alcohol to re-dissolve the resin residue.

Either that or find alcohol-free gas