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black smoke on startup

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go to the yz250f forum, and look in the jetting sticky at the top of the forum. find out what guys at your altitude are using for the pilot, main, needle clip, and fuel screw settings.

go here:


you can do it with some patience and research.

....or you can take it to a local shop and pay them $100.

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i took my ttr to the yamaha shop and they screwed it up every time. i like to do my own work


spend some time reading in the yz250f forum. the jetting sticky is fairly helpful. do some research on the basics of jetting, and you'll save yourself some headaches in the future. it will just take some time.

good luck.

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