I have three motors. I decided to upgrade the spark plug wires because of the cheap, poorly engineered bakelite boot on the ones that come with the kit. One of the plug wires easily unscrewed from the CDI and the new one screwed in. End of problem. The second one was a different story. I tried to unscrew the wire and it would not come loose. I tried pliers and ended up twisting off the wire. Then I tried to dig what was left of the old wire out of the connection to no avail. Apparently they have started gluing the wire in with some kind of glue or something. I guess Mr. Grubee wants to make sure that his low quality parts stay on his low quality motors.