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250f running bad

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The last few times I've been out to ride/race my bike it sounds different when I let off the gas, usually in 1st or 2nd. It sort of sounds like it's running out of gas but it's not. The bike is an 04 and I've been riding/racing it for the last year pretty often. I have a few mods; power now, fmf factory 4 system, and rejetted. Anyone else experience this. 😢

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If it's getting cooler where you live/ride, then maybe your bike is running a little lean with the cooler weather. You might try raising your needle one position, and go up one on the main as well. Adjust your fuel screw to suit.

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I did awhile back raise the clip 1 notch and went from a 180 to a 178 main jet and it is cooler and less humidity here now. I took my plug out after riding today and it was very white with very little black on it. I was hoping it wasn't the valves or the timing chain. I will richen it up and see if that takes care of it. Thanks a bunch.

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