In January I bought a '93 K1100LT that had just been serviced by BMW of Denver. The previous owner gave my all the service records. They have Bosch XR7LDC listed as the plug they installed. The stock plug is a XR5DC.
I looked in a Bosch spark plug catalog and I can't find the XR7LDC listed. I pulled one out of the bike and looked at it. It is a dual electrode plug.
Does anyone know anything about these plugs? Are they O.K. to run in a K11? They have been in the bike all summer for about 8k miles without a problem. I did notice that cylinder #3 is running leaner than the others. I don't think I ever noticed that on my old K100.
Any info on what the heck these plugs are for will be appreciated.