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Condensers (capacitors) do go bad over time and their original microfarad (uF) rating will get higher as they do. Bad or leaking caps will cause weak spark and burned/pitted points over time to. Your ’49 Speeditwin came equipped with a cap rated at .30 (.27-.36) uF so it’s replacement should be checked for leakage and to see if it falls in this range. If the spark at the plugs is weak, you can try closing up the plugs gap a bit to .025 and see what happens. This is all done after making sure the points are clean, polished, and free of any oil film before gapping them. Since the coil fires both plugs at once, it needs all the help it can get to do this.