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  • If it was my (elderly) moped it would be sludge or rust particles in the float chamber causing the float to stick with resulting fuel starvation. It does it every now and then because the Amal in-line filter (alloy body, nylon mesh) looks the part but is little more than a strainer: something less period and more effective (with a transparent body and paper element) is needed at some point.
    It might be just a blip but it's probably worth looking into - clean the outside of the carb first, have the jets out and remove the top of the float chamber - large particles making their way into the combustion chamber are a bad thing, so if you find anything at all it's definitely time to fit a (better) filter. Hot spots, pre-ignition, holed piston and broken rings are possibilities as well as a scored bore...

  • I had one of those filters too, has it got a block of metal mesh. If so it is not a good filter.

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