Ignition upgrade for a 1979 Chrysler 20hp 202H9K

[Skychasen]

Hi folks, newB here. I’m having a backfire problem and I’m looking for information about upgrading my points ignition to CDI. I have replaced the points, condenser, coils, reeds, rebuilt carb, plugs, and still have a backfire. I ordered new crankshaft seals and can’t think of any other reason why it still has a problem. Any suggestions recommendations or information is appreciated.

 

[Bondo]

Ayuh,..... Welcome Aboard,..... 99.9% of the time, a backfire is caused by a Lean condition,.....

 

[Chris1956]

A backfire means that the ign system is working. Why do you want to change it to a CDI unit?

Generally, it is hard to upgrade ot a CDI unit, and unnecessary. However, in the 70s, we had points/coil ign on our car. However, my father installed a CDI unit that was wired between the battery and the hot side of the coil, and also between the points and ground side of the coil. The CDI unit took the battery voltage, stepped it up to 300V, stored it in a capacitor and then used the points as a trigger to fire it into the coil. Perhaps you can still find one of those style CDI units, or something similar.

This is the one we had.

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