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Thread: wierd jetting problems!

  1. #1
    Join Date
    Oct 2006
    Location
    oconomowoc WI
    Posts
    1,136

    wierd jetting problems!

    i jetted my 250ex with a full sparks and have a K&N and stuff, it was about 30 degress's out so i jetted it amd i kept going up in sizes to richen it up and now its like 34 degress and i whent down like all the jets i whent up? its weird and it kinda cutts out in 1 and 2nd gear and revers like its getting to much gas so im gonna go to a 96 or a 92 and i was up to a 104 and man i just didnt want to burn it up and the plug just isnt darkening up like i want it so any help with the wierd jetting problems.
    2005 250ex
    DG- A arm guards
    Skid plate
    Sparks X-4 full system exhaust!
    K&N Jet Kit
    K&N air filter and outer wears
    SOLD!
    ------------------------------------------------
    2003 400ex.
    graydon nerfs
    skid plate
    A-arm guards
    Pro Armor XC Bumper
    Black HMF slip on
    Dyno Jet Kit
    K&N air filter
    Outterwears pre charger

  2. #2
    Join Date
    Jan 2007
    Location
    Mtn. view missouri
    Posts
    1,745
    no no thats waaaaay too lean try like a 112
    Brad Harrell #927
    www.oxcracing.com

    08 yz250f

  3. #3
    Join Date
    Jan 2007
    Location
    Mtn. view missouri
    Posts
    1,745
    no no thats waaaaay too lean try like a 112 im runnin a 125
    Brad Harrell #927
    www.oxcracing.com

    08 yz250f

  4. #4
    Join Date
    Jul 2002
    Location
    Jackson NJ/Daytona Beach FL (school)
    Posts
    1,216
    I posted up a STICKIED thread with jetting recommendations in there, and it is still overlooked. Unbelievable.
    Respect is earned, never given.

    2002 250ex- SOLD.

    Creator of the 250EX Performance FAQ. For 250ex headwork and various porting , please email me at flyinryanporting@gmail.com

  5. #5
    Join Date
    Oct 2006
    Location
    oconomowoc WI
    Posts
    1,136
    i did look and didnt help......... well im in SE wisconsin the jet kid saide from 92-98 and i was to 104 now for summer im gonna try 92..... im at 96 and it still cutz out in the lower gears when i putt around???? im guessing cuz its wayy to rich! so yea?????????
    2005 250ex
    DG- A arm guards
    Skid plate
    Sparks X-4 full system exhaust!
    K&N Jet Kit
    K&N air filter and outer wears
    SOLD!
    ------------------------------------------------
    2003 400ex.
    graydon nerfs
    skid plate
    A-arm guards
    Pro Armor XC Bumper
    Black HMF slip on
    Dyno Jet Kit
    K&N air filter
    Outterwears pre charger

  6. #6
    Join Date
    Jun 2005
    Location
    Illinois
    Posts
    4,104
    Originally posted by 250exkid
    i did look and didnt help......... well im in SE wisconsin the jet kid saide from 92-98 and i was to 104 now for summer im gonna try 92..... im at 96 and it still cutz out in the lower gears when i putt around???? im guessing cuz its wayy to rich! so yea?????????
    I live 2 hours away from you and the stock main jet for me is a 95. Even a 96 would be very low for a full pipe. Try going higher.
    406ex - January '13 QOTM

  7. #7
    Join Date
    Oct 2006
    Location
    oconomowoc WI
    Posts
    1,136
    but why does it cutt out like its getting to much gass in low gears when i putt around? when i give it all its got it goes like no other so?
    2005 250ex
    DG- A arm guards
    Skid plate
    Sparks X-4 full system exhaust!
    K&N Jet Kit
    K&N air filter and outer wears
    SOLD!
    ------------------------------------------------
    2003 400ex.
    graydon nerfs
    skid plate
    A-arm guards
    Pro Armor XC Bumper
    Black HMF slip on
    Dyno Jet Kit
    K&N air filter
    Outterwears pre charger

  8. #8
    Join Date
    Jul 2002
    Location
    Jackson NJ/Daytona Beach FL (school)
    Posts
    1,216
    Originally posted by 250exkid
    i did look and didnt help......... well im in SE wisconsin the jet kid saide from 92-98 and i was to 104 now for summer im gonna try 92..... im at 96 and it still cutz out in the lower gears when i putt around???? im guessing cuz its wayy to rich! so yea?????????
    Find out the elevation for your area, and give me the approximate temperature for this time of year. I'll come up with a jetting recommendation.

    EDIT: I looked it up myself. The following setup should put you close to where you need to be. DO NOT LISTEN TO THE JET KIT INSTRUCTIONS.

    1000 ft elevation, 30 degrees F

    108 main (i'm assuming you're running a lid)
    e-clip on the 4th setting from the very top
    38 pilot with the air screw 3 turns out
    Respect is earned, never given.

    2002 250ex- SOLD.

    Creator of the 250EX Performance FAQ. For 250ex headwork and various porting , please email me at flyinryanporting@gmail.com

  9. #9
    Join Date
    Oct 2006
    Location
    oconomowoc WI
    Posts
    1,136
    below 3000 ft sea lvl temp around 35-43 but i wanna plan for wayyyyy hotter weather to. umm do i have to mess with the air screw?
    2005 250ex
    DG- A arm guards
    Skid plate
    Sparks X-4 full system exhaust!
    K&N Jet Kit
    K&N air filter and outer wears
    SOLD!
    ------------------------------------------------
    2003 400ex.
    graydon nerfs
    skid plate
    A-arm guards
    Pro Armor XC Bumper
    Black HMF slip on
    Dyno Jet Kit
    K&N air filter
    Outterwears pre charger

  10. #10
    Join Date
    Oct 2006
    Location
    oconomowoc WI
    Posts
    1,136
    found the problem..... the spark plug gap got kinked! i fixed the sputtering.......
    2005 250ex
    DG- A arm guards
    Skid plate
    Sparks X-4 full system exhaust!
    K&N Jet Kit
    K&N air filter and outer wears
    SOLD!
    ------------------------------------------------
    2003 400ex.
    graydon nerfs
    skid plate
    A-arm guards
    Pro Armor XC Bumper
    Black HMF slip on
    Dyno Jet Kit
    K&N air filter
    Outterwears pre charger

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