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Message: [QUOTE="BikeDstroyer, post: 165965, member: 23959"] I have to agree with Humai. I have the 250WR & not the 426 but the concept should be the same. I went to Colorado the first time with the grey wire mod but WR timing and the bike worked fine. The next time I went I changed to YZ timing and it was actually much easier to ride. Throttle response was much better, easier to get over logs & such. I didn't have to change my jetting but with the 426 I guess you might have to. Change it and have a blast. If you for some reason don't like it you can always change it back. [/QUOTE]