6 volt systems don't have the snap of a 12 volt system. They generally take twice the amperage of a 12 volt system. A drop of one volt can make a...
Chances are that you probably have the stock spring which have sagged a little over almost 30 years and now the main set of springs are touching...
Sound like the carbureator has either dirty idle wells or it has a vaccuum leak around the thorottle shaft. Could also be ignition problems also
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