The JD will allow a simple redial of your jetting.
I got my 2006 Wr450F two weeks ago....
Some questions I have not yet cut the grey wire or fiited my JD jet kit or the Zip Ty fuel screw, what will these mods do for the WR, make it smoother? even more acceleration. Has anyone made the grey wire switchable to be used in different riding conditions?
Finally thanks to all of the excellent information in this forum
The Fuel screw - which ever brand will allow better fine tuning of idle and just off for better low down throttle response.
The Grey wire earths the CDI map for the YZ. Only detected on start (power up) so non switchable on the move. You can reset to WR, but have to stop-start the motor again...