Winter yz jetting

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11/7/2018 8:34 PM

I've got a completely stock 18 yz250 with stock jetting. Starting to get a little chilly here in TN. What jets should I change to account for the lower temps?

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11/8/2018 5:19 AM

what jets you need to change is entirely dependant on how far your throttle is open when you have issues.

That being said youll need richer jetting for colder weather. You might get away with adjusting your clip position and adjusting the air screw

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11/8/2018 7:28 AM

In general, if the bike is properly jetted for one particular ambient temp, the main jet does not to be changed unless there is a difference of at least around 30 degrees in ambient temp providing there is not a significant change in the elevation it is being ridden at.

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11/8/2018 7:31 AM

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11/8/2018 7:44 AM

the last yz250 I had was a 16 so should be the same as yours, I ran stock jetting from 45 degrees to 90 degrees here in new England, straight race gas 32:1 with spectro sx premix

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11/11/2018 3:29 PM

I rode today in NH and my jetting was really good. 0-1500ft
38* degrees F
Pilot 50
Needle N3EW 2nd clip
Main 180

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11/13/2018 12:51 AM

Run it then check it. Sometimes the cold weather (depending on how cold) will clean up the jetting and make it perfect.

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11/13/2018 6:44 PM

Where do you live in mid tn? I live in Dickson!

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