If your points are clean, all the wiring is good and the flywheel magnets are strong, your condenser (capacitor) may be getting tired, especially if it is the original one, and causing a weak spark. The original cap, P/N 171448, was rated at 0.1 uF and may be replaced with modern capacitors. The Vishay axial and Orange Drop in the picture both work good. The Vishay is smaller and with the leads coming out the ends, it’s easier to install.
http://www.digikey.com/product-search/e … =BC2607-ND
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