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Yz250 needle n3ej vs n3ew

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The 'J' needle has a thicker straight section than the 'W', which means it will make the engine run leaner at low throttle openings (1/4 throttle). Look in the jetting section of the owners manual, it gives a pretty good description of how this works. 

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On 7/29/2017 at 8:27 PM, Rider1998 said:

Is it bad to run the J

Stay away from Js son, it's the devil's lettuce rolled up into an evil cigarette!

 

and no, as long as it's jetted correctly and runs right. If it runs good, no reason to mess with it, but people have trouble with the stock needle sometimes.

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If you're curious. Try both needles and see which one you prefer. Not a huge difference if you turn your airscrew in a bit with the "J" needle. Just remember to fine tune with the air screw to your liking.

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The W needle might allow you to use a one size smaller pilot jet (vs what works with the J) for similar but different jetting.  eg. The smaller pilot might allow a more steady low idle.  You'll have to try both. It's not a big change.

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