Make sure the plug wire is screwed tightly into the coil, screw it out and back in just to make sure. Coil may be weak, hard to tell, condenser may be a problem as well. If you get one of these type of module you don't need the points or condenser. If you fit one of these and spark is still weak then the coil is the problem
www.ebay.com.au/itm/Universal-Ignition-Module-Suit-Victa-Briggs-More/302679164835
