I've read all of the issues with spark plug boot/caps coming loose on M3W's, many seem to have this issue.
There has to be something not quite right about the spark plug boot/cap being used. How many of you have ever had "other" boot/caps come loose on other vehicles, or any gas powered motor etc?
My Harleys have lots more vibration than what the S&S motor produces and the spark plug boot/cap coming loose or off is not an issue.
It's not a big deal to swap out the boot/caps with another brand. Even a Harley boot/cap would be better in my opinion as this is NOT an issue on any of the forums I participate in.
I just looked at a downloaded picture of the wire routing. It appears they are cable tied to a brace coming forward and it appears there is a loop in the wire, but just make sure that with vibration there is a large enough loop that it's never under tension.
