1977 Puch Newport. All stock. Been setting for probably 35 years. Overall good condition with everything there. I am not getting any spark at the plug and need some advice on trouble shooting. The on/off switch is broken but it is in the on position and the wires have continuity. I ran a piece of 400 grit sandpaper through the points but that's as far as I've gone. Electrical issues are not my strong suit, so any suggestions will be appreciated.