Another Gray (Grey) Wire Question

I just purhased a bone stock 1998 WR400. I have studied all of the "free mods" and I have studied the wiring diagrams for the bike.

The wiring diagram has a gray wire and a black wire w/gray stripe coming from the CDI unit to a two wire connector. From the connector on there is only the black wire w/gray stripe that runs to the engine cut-off swith and then to ground.

As I have not taken anything apart yet, here are the questions:

1. Is this the gray wire described in all the "free mod" descriptions?

2. Unless there is a jumper and the gray wire loops to the black w/gray stripe wire, providing some type of feedback to the CDI unit. Why does this effect the CDI spark mapping?

It's not that I don't believe everyone that says there is a significant performance improvement, it's just that it's too cold to ride here in Michigan and inquiring minds need to know! :)

Thank you for the reply. I have been looking at the info on thumperfaq, but I didn't get to the bottom of the article (stopped at the pictures, just like when I was a kid).

Until it gets warmer and I start taking it apart, I'll have to settle for what I've got. :)

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now