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YZ Exhaust on WR250F, rejet required?

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Well, first, please don't go with a loud muffler on your WR. There are too many loud bikes out there already. Instead, buy different cams and an FMF Q4, and you will see better power gains.

You will likely need to dial the jetting a bit.

My experience was that when I had my WR tuned up with better exhaust and more aggressive cams, the JD kit didn't cut it and instead, needle & jet needle for from OEM 09 YZ250F worked very well.

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I put a 04yz muffler on my 06wr

yes it is louder but I ride with guys that have yz's so whats the diff...

yes you will definitely have to rejet the carb 

yes I do feel the bike runs better with the yz exhaust, You have to spend time tuning or its NOT worth it

I have spent a lot of time tuning my bike and it runs good - engine n suspension

before I put the yz exhaust on, friends would ride my bike n when they got off the bike would say "WOW that's a wr? that runs good "

stock the was choked and no power

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