2005 crf250r White bros aluminum pro jetting question
  • Tmoneytrojan
    Posts:13
    Joined:Thu Feb 22, 2007 11:22 am
    2005 crf250r White bros aluminum pro jetting question

    by Tmoneytrojan » Thu Feb 22, 2007 11:30 am

    Hey guys I am brand new today. I know this topic has been brought up many times but I just needed to ask for my self. My bike is completely stock other than the header and exhaust.I live in portland or around 200 above sea level. my bike seems to running a little rich with the stock jets. but white bros suggests using a 155 main with a 6 postion needle, this seems like i'd be getting more fuel from closed throtle to 3/4. anybody else had this same situation?
  • User avatar
    KevinM
    Posts:474
    Joined:Tue Mar 14, 2006 12:21 pm

    by KevinM » Tue Mar 06, 2007 7:04 am

    Tmoney... I'm not sure which main jet was stock in the 2005 250R. I though it was a 170. My '07 had a 175 main jet as stock. I went up to a 180 and it seems to run ok in the chilly NJ weather. But the jury is still out on that. I may go back to 175. My bike is 100% stock aside from the jetting. Oh yeah.. I was running the JD blue needle but changed to the Red needle since it's getting warmer. 5th position down. And I just changed the pilot from the 42 stock to a 45. It was still tough to start in the cold with the 42.

    I just wouldn't expect stock jetting to be too rich. But I admittedly have less experience than most with jetting.

    a 155 just seems too lean to me at 200' MSL. I think the Honda needle of choice is the NCVS. Probable 4th or 5th position for your altitude is where I'd start.

    one more thing. If you start changing things around.. make sure you know where you started.. main, pilot, needle, clip, Fuel screw turns.. so you can get back to stock if you aren't getting good results.

    And you can always buy the JD kit with a new pilot and follow JD's instructions. Thats been a safe bet for anyone that I know of who's done it.
    09 CRF 450R
    07 CRF 250R
    45 plt /175 main /JD Red-5th pos
    FS 2 trns
    05 CRF 250X
    42 Plt /162 Main /JD Red Needle- 5th pos
    CRFsOnly Fuel Screw 1-7/8 trns out (2 turns winter)
    TwinAir PowerFlo Kit /Opened Airbox /White Bros E2
  • crf861
    Posts:14
    Joined:Wed Mar 14, 2007 7:21 am

    by crf861 » Tue Mar 20, 2007 9:10 pm

    Stock is like a 178 that year.

    From what I can remember about the 05 with the Carbon PRo:

    45 pilot
    175-178 main
    Blue needle 5th clip
    #60 leak jet


    This is in salem.
  • Asmith
    Posts:14381
    Joined:Mon Apr 10, 2006 7:52 am

    by Asmith » Tue Mar 20, 2007 9:45 pm

    Stock was:

    Needle NCYQ #3

    Main jet 172

    Pilot 42

    Leak 70

    Fuel screw @ 1 3/4

Who is online

Users browsing this forum: No registered users and 4 guests