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I just bought an '02 WR426F and I am interested in learning more abouth the free mods. When uncorking the pipe, do I need to rejet?

Any advise on how to get the most out of my new bike would be appreciated.


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You will not need to rejet with the pipe core pulled. Pull the cover off your air box you dont need or want it, except when washing it or transporting/trailering it in heavy rain, keep that filter dry.

Check the bottom of the main index for archives, things you will want to look for, throttle stop mod, this is a must as the throttle is only opening 1/4. You can unscrew the stop and cut it to length with dremeltool / hack saw, look in the archives for the correct length These 3 mods will get the bike back to normal, running as it was intended to. Other mods include yz timing, bk mod, grey wire(debatable whether it does anything) And rejetting with a new pipe.

I would do the first 3 mods, get used to the bike and tweak on it later when you have the bike figured out.

Good luck

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