I was trying to start my sled on Saturday, and I couldn't get it to turn over. My 98XC600 is "Coldblooded", so I knew it was going to take a few pulls. After awhile I started to get concerned. I checked many things before pulling the plugs and checking the spark. The port side plug was not firing, so I switched the plug, and still no spark. The CDI is pretty new. Could anything else cause this or do I need to buy another CDI?