Rebuild questions

I'm going to be doing a top end rebuild soon on my 2009 kx250f I was wondering since I had to change some jets here at the end of my racing season because my top end was getting so bad. And it's running super rich. Should I change all the jets back to stock when I do the rebuild. Just doing an OEM kit nothing fancy.

First off make sure your replace the timing chain when doing the top end. Kawi Suzuki and Yamaha (so far) share the same timing chain on the 250F's. You can save a good bit of money buying the Yamaha timing chain as it is cheaper even though the three manufacturers spec the exact same chain.

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