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need jet specs for kx250f 290 athena BB

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On my '04 I never had to rejet when I went to 290. 2 friends have the Athena 290 on their '06 YZ250's and they never had to rejet either. Are you sure you have to rejet?

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I have the same kit. Here is the jetting I came up with for sea level, humid, 85-95 degrees; Stock pilot, stock leak jet, 200 main, JD red needle 5th clip position, fuel screw 2 turns out. Found I may need to go leaner on the pilot 1 size for hare scrambles. Bike seem to stall easliy in the woods. Works great on a moto track. I should note that I also have a Boyesen quick shot as well.

Good Luck

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On my '04 I never had to rejet when I went to 290. 2 friends have the Athena 290 on their '06 YZ250's and they never had to rejet either. Are you sure you have to rejet?

for John407,

What is the elevation where you live? .. I'm at 3450 ft above sea level..

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