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FXR Plug Wire Keeps Popping Off Coil

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Old Feb 26, 2025 | 05:32 PM
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Bobby Dieken's Avatar
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Question FXR Plug Wire Keeps Popping Off Coil

Often when I ride I will lose a lot of power and the reason is that my plug wire had come off the Coil. Obviously this ultimately stalls the engine and won't start until the plug wire has been reconnected to the coil. My question is what cause this? Is it simply crimping the end of the plug wire?
 
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Old Feb 26, 2025 | 08:21 PM
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Pull the boot back and look at that crimp on wire end and brass clip to coil, inspect the coil for damage. How old are the wires?
 
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Old Feb 26, 2025 | 09:24 PM
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I'd buy new wires. Easy fix for the problem. Stock replacements would be fine.
 
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Old Feb 27, 2025 | 06:26 PM
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Cheap and easy. Zip ties. Worked for me.
 
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Old Mar 4, 2025 | 11:15 PM
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Or a new coil. I had one that broke one mounting ear off after just a few months of use. I imagine the Chinese can screw up the terminals just as bad.
 
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Old Mar 4, 2025 | 11:42 PM
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It can be heat buildup inside the boot expanding the air and pushing the boot/cable out. Punch a small pin hole in the boot with a needle.
 
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Old Mar 5, 2025 | 10:56 AM
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I had this happen to me on a road trip to AZ one time. Dam plug kept popping off the coil. The last straw was when I reached down while riding to push it back on and got zapped. Nothing like a jolt of electricity while passing through the desert in the middle of the night to wake you back up. Ran a couple zip ties to hold it on to the coil and ended up riding it like that for over a year haha. Finally replaced the wires and didn't have an issue since. Not really sure what causes it but assuming its the slip fit on the wire terminal becoming loose from vibration, heat, etc.
 
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