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To richen a 04 Crf250r?

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In a march 2009 Motocross Action Magazine I have, they give recommended jetting specs for every 250r to date. They state the 04 is lean all through the range and recommend richening the main, pilot and needle. Any feed back on this?

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Do not just do what others do, do what YOU need to do. What running issues are you having? What is the current jetting? BTW, 'stock' is not an answer.

It seems like its running pretty good. I was thinking about changing the main from a 160 to a 165. Its a big bore too so maybe a larger jet would help?

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If it is running good, it will not run better.

 

With a big bore, you run leaner jetting, not richer.

 

Main jet only affects 7/8ths throttle and above.

Thanks for the advice, ill leave it alone. 

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