HEADS UP!!!

Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0
trunkmonkey55

2004 WR450F Gray Wire Cut

9 posts in this topic

The gray wire tells the electronic ignition computer whether it is a YZ computer of a WR computer. If you disconnect the wire then the computer thinks it is installed on a YZ and therefore gives your WR the YZ ignition mapping.

The actual job is simple and is well documented here and elsewhere. Good luck!

Share this post


Link to post
Share on other sites

Really what the grey wire does what I've learned is a WR'S timing is retarded at mid to upper RPM. Why? no good reason I want to know about. But I'll tell you that when you (Cut the grey wire) the bike runs alot stronger in the mid to topend. Without hurting the bottom end at all. Ther only thing I would suggest is not cutting the wire but pulling it out from the 6 pin connector on the right side of the tank so that if you want it back you can put it back together.

Share this post


Link to post
Share on other sites
:) I didn't change the cam timing, just unplugged the wire. Runs a little bit better.

Share this post


Link to post
Share on other sites

yamaha made our bikes to be able to pass a 85db test. the exhaust and air box are plugged up to help meet these standards. the ignition timing is altered to go with all that. yamaha did us a favor by having the second ignition curve programed in. honda has done the same thing with the new crfx250. they just say it's for "closed course use".

Share this post


Link to post
Share on other sites

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
Sign in to follow this  
Followers 0