YZ 250F Jetting

4 replies to this topic
  • scooter

Posted November 27, 2000 - 06:44 PM


I'm looking for a little help jetting my 2001 250F. I think the smaller motor is a lot more sensitive than my 99 400 on the air/fuel side of things. I live in Boulder CO @ 5300 ft. elevation and am riding MX @ about the same elevation. The weather has been on the cold side this month and pretty dry humidity wise. I have set the pilot screw @ 1 1/2 turns out and I can start it no problem with the motor stone cold, 2 or 3 kicks max. If the motor has been started or ridden it will not restart w/o cracking the throttle while while kicking (if @ all, hot start or not). I have run 2 full tanks of fuel through the bike as of today, so it's almost broke in. I plan on buying jets tomorrow. Gotta love these things, they feel about 100 lbs. lighter and make great power. Any thoughts?.....Thanks

  • jimt_yz400

Posted November 27, 2000 - 08:44 PM


How soes the 250f pull? Are you satisfied
with the performance? I should be getting
mine next week and I can't wait to swing
a leg over it. Do you feel that it is faster
than a 125?

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  • Guest_Guest_*

Posted December 06, 2000 - 03:04 AM


what do you Guys think when riding the new YZ250F ?

Got seriously hurt two years ago so I have kept my YZ400-98 until now as it haven't been ridden that much.
but I'm planning a Come-back, and the biggest complaint I had about the YZ400 was the sort of heavy feeling compared to a 250cc 2-stroke, but on the other hand everything else is easier on the YZ400.

I have ordered a YZ250F, but here in Europe( Sweden)they will not be available until early spring. but it does not matter, as it's winter here ( i.e.like Minnesota)

please give some YZ250F riding experiences.
Especially have is the torque on low revs ?
have owned -XR250/400/600- / -DR350-, KLX250/300 trail bikes, and a # of 250cc MX:ers

  • James_Dean

Posted December 06, 2000 - 07:57 AM



Would you post your jetting for an assessment of what could be done. Here or at my other requesting thread, with complete specs - pilot, pilot screw, pilot air, needle code and clip#, main jet, main air. You don't need to tear it apart, just look in the manual.


  • James_Dean

Posted December 07, 2000 - 10:38 PM


If you want help scooter, post the jetting.

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