A properly charged and healthy battery would be the first place to start.
You need to find out for sure what coil is on it. Some 12v coils require a resistor, some don't. You may be able to research this from the part number, but if not you can check it yourself.
You'll need an ohm meter to check the resistance across the 2 terminals.
First, check just the coil. Disconnect the wire from the + terminal. If the resistance across the terminals is around 3 ohms, the resistor is not needed.
If the resistance is lower, 1.5 to 2 ohms, the resistor needs to be connected.
Next, reconnect the + terminal, and disconnect the ignition wire from the resistor. Now, put the ohm meter leads from the resistor terminal where the ignition wire was disconnected to the - terminal on the coil. (Connecting the resistor in series with the coil.)
Again, the reading should be around 3 ohms. If the reading is higher, the spark will be weak.
There could also be other ignition problems. Be sure the distributor is in good working order, as in the amount of side play in the shaft bushing. If the shaft is loose, the points won't stay set properly.
Also the new aftermarket ignition parts are notorious for being bad out of the box, especially condensers. Might try the old condenser if suspect.
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