Hello, when I tried firing up the motor it wouldn't start. Turned out to be the fuel bulb. Any way I first checked for spark by holding the boot and touching plug to the motor and my buddy pulled the cord. Well one wire came out of the coil. Put it back in and it was fine. The second one shocked me so I want to replace both. The coils are three years old. Can I use any wire?? Is it 7mm?? Where can I get them. Thanks.