Had my spark plug wire burn out on my 15 XM last month and had another one go on my 13 XM yesterday. Never had this issue before so you XM riders might want to check them
My 15 I noticed when checking it out at night running, you could see the wire sparking. My 13 started to run on one cylinder so I looked to see if it was the same problem and the wire between coil and spark plug was totally burnt.