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Hello, I'm confused about my multimeter is reading .740k ohms on the front spark plug cable and .300k ohms on the rear cable. I bought some aftermarket plug cables, and the new ones read 7.50K ohms on the front spark plug cable and 3.40k on the rear cable. I assume that ".740k ohms" would be 740 ohms and the new ones are 7,500 ohms. Wouldn't the new cables be too much resistance? This is for a 2004 HD Dyna lowrider EFI.
The 2004 uses the ion-sensing technology for spark knock control. Because of that, Twin Cams with the Ion-Sensing technology can be picky about the plugs and plug wires you use.
If they are not to OEM spec, they may cause issues with the ION-sensing. There have certainly been reports of soms causing issues. I have not taken the time to try and make note of those that have been reported to cause issues.
Since on a street driven motorcycle, Hi-Performance plugs (read; high cost) and/or plug wires give no advantage over the OEM spec parts.
So I always use HD plug wires and HD Plugs, or the Champion equivalent RA8HC Plugs. (Champion's version of the plug Champion makes for HD Twin Cams #6R12).
I doubt if the difference between the two wire sets will make a difference in the spark. The primary effect of more resistance is to reduce the duration of the spark event, which actually reduces wear on the spark plugs. Within reason, duration doesn't matter; once you light it off you don't need any more spark.
Whether or not it will have an adverse effect on the ion sensing, I can't say. That system is PFM to me.
I would definitely just run the OEM wires, SE version if you want them a different color but OEM are gonna serve you just fine.
Full disclosure, I have my OEM coil in the pocket under the seat so had to cut wires to the length I needed, and had to solder an extension of the power wires leading to the coil.
My spark plug wires go up under the tank and then back to under the seat so both are longer than stock with the front wire being probably every bit of over 20-22", should have wrote it down but I didn't. Never any codes and runs as if it doesn't know the difference. Used these big fat wires.....
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Plug wire spec Dyna 2004 EFI
