Hello, I have a '91 Ski-doo mx and it has some issues. Last year when it was running it was getting harder and harder to start. (harder to pull the cord) Then it just stopped working. This year I pulled it out and took the plugs out. The cord is easy to pull now. But it still won't start. I tested it for a spark and didn't see any. One of the spark plug caps has tape on it. Apparently it had problems with that before. Do you think it needs new plug caps? Or could it be the wires? And what is the thing that the wires connect to? Could that be it? Thanks for any help.