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need some help

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I just installed a FMF Fatty and FMF shorty on my 99 yz250 and its running like crap.. i was wondering if this could mean i need to change the jets or is it something else it ran fine before..

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I'm not trying to be a dick, but this is "Thumper Talk", not "2-Stroke Talk". You may get some help, but you'll likely have better luck with a 2-Stroke forum. It's not that this place is full of snobs, it's just that the knowledge base is limited. Sorry bud...SC

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completely understand i do know what the forum is.. and i do belong to other 2storke forums but thumpertalk no matter a pinger or a thumper i get the most helpful information here and the fastest relpies

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raiderx72,

Try moving the needle clip position in your carburetor. The 2nd from top is a good place to start on a '99YZ250. The pilot jet can be lowered from a #50 to #45 or 48 if the idle still seems rich.

Hope this helps,

James

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where is running like crap at? Like top end or about middle throttle. If its running like crap on the top end I would say you are running lean. Do a plug check and go from that.

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