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It"s not nearly as important to have a strong spark at the points as it is to have a strong spark at the plugs. To do that, you need to have the points clean(no oil or corrosion), adjusted properly and the distributor and the coil must be functioning properly. It goes without saying that the engine must be in reasonable condition and the carburetor adjusted properly. Pull the wire out of the center of the distributor cap, hold it near a good ground( about 3/16" away), turn on the key and try a start. YOU SHOULD HAVE A FAT, BLUISH-WHITE SPARK. Anything else( yellowish, orangey, skinny blue sparks are not good) and there is something wrong with you primary ignition circuit. Make sure the your distributor shaft /bushing is not worn excessively. Rotate the engine until the points close then push on the distributor shaft radially(from the side)back and forth, observing the points. You should see no motion at the points. If you do, it"s time for a distributor rebuild. It is very difficult to adjust points that have operated for a while because the surface is slightly roughened as opposed to new points. To clean the points of oil, take a piece of a brown paper bag and pass it betwween the closed points.
Condensors some time go bad and even new ones can be bad out of the box.
The wire to the coil from the distributor should be connected to the coil terminal that matches the battery ground( i.e if the battery is a (+) ground than the coil wire to the distributor should be on the (+) terminal of the coil).
All the connection in the primary ignition circuit should be "bright and tight".This is particulalrly true for 6V systems. Make sure that you have battery voltage to battery side of the coil when the key is ON and the points are closed. If you don"t, check the circuit to find out where you have excessive resistance. Sometimes it"s the key switch that goes bad. Check these things out systematically til you find the root cause of your problem.
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