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Zenith 40 TIN Carburator Tuning
Looks like bad ignition wires may have something to do with my backfiring problem, but I'll have to get some new ones before I'll know for sure. I initially did not suspect them, because they were a new set a few years ago, but I pulled the spark plugs, and 2 of them looked completely clean, while 4 were heavily sooted with carbon. This led me to check resistance values of individual plug wires. While all the wires are stranded coper core with 0 resistance, 3 of the spark plug end connectors read exactly 2.9K Ohms between the plug end and the wire end, where it screws into the plug wire, 1 reads 14.7K Ohms, and 2 appear to be open circuit. This made me wonder how it could even be running at all, but I guess high voltage ignition systems can overcome a lot. I assume the 2.9K Ohm connectors are good, but at least one of them was connected to a cylinder that is backfiring badly. Anybody had any experience with the plug connectors?
Once I get the ignition wires sorted out, I resume the carb tuning.
69BahamaYellow
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