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Old 09-30-2014, 04:40 AM   #1
jclark83 OP
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Oddometer: 362
R100GS Spark Plug Wire Question

I guess one of the joys of owning and wrenching on older bikes is the unexpected suprise you find every time you work on them. I had a hard start issue at a rally over the weekend. The bike sat outside in the cool damp evening air overnight. In the morning it took a lot of cranking before it finally started. My initial thoughts were cracked coil or bad plug wires. It first started on one cylinder then picked up the second cylinder after a few revolutions. The bike ran fine after it finally started. The first thing I checked were the plug wires, they are copper core wires with screw on metal caps. The left wire checked a solid 1K ohms, the right wire fluctuated between 0 and 1K depending on how I flexed the wire at the cap end. I cut about 10mm off the right wire and screwed the cap back on, solid 1K ohm reading. I was given a spare wire with the bike, metal end molded to the wire, it checks 5K ohms. I did my internet research before checking things out and was surprised to find 1K wires with what I assume is stock electronic ignition. The spark plugs are NGK BP6ES. The bike starts and runs fine. I do not know how long these wires have been on the bike, I have only owned it for 4 months and put around 3k miles on it. Should I change out the caps for 5K ones? Is the ignition system damaged from the 1K caps? It has a motoelectric 400w alternator upgrade, does this effect anything with the ignition?



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Old 09-30-2014, 05:46 AM   #2
Warin
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Alternator will have no effect on the ignition system (assuming both working).

Change the plug caps for 5k ones.. the sooner the better. Risks .. the ICU and/or the coil (probably stressed, could lead to early failure). Suggest you carry spares. Including a spare spark pug, plug cap and HT wire. The spare coil takes a bit of room, the rest are easily fitted/hidden somewhere.
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Old 09-30-2014, 09:35 AM   #3
jclark83 OP
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Fresh plugs and wires with the proper 5K caps are on the way. I guess time will tell if any damage has been done to the ignition system. It's hard to tell how long the 1K caps were on the bike.
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