Backfire: Carb? Timing? Coil?

[bmorgil]

MJ, it is possible the coil does not need a ballast resistor. If so it will say so on the coil. If it needs one and you don't have one, it could burn the points in a shorter period of time.

[Bohonkie]

Thanks. I didn't know about that. I'll check but I suspect it's OK since I changed points only every couple of years and they are never burned. Lots of yard work... preventing me from working on this... gotta change that soon! mj