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Jetting for an 06' CRF 250x with mods?
  • Andy Duffus
    Posts:76
    Joined:Wed Oct 11, 2006 5:57 am
    Jetting for an 06' CRF 250x with mods?

    by Andy Duffus » Wed Feb 28, 2007 9:14 pm

    I have an 06' 250x that I am building for riding here in Western Washington (Walker, Reiter, Belfair and Capital Forest) 0-500 feet. Usually in the 50-80 temp. range when we ride.I'm looking for recommendations on which jetting and settings to use. I have a JD jetting kit and I am waiting for a Power Surge kit. I've opened the top of the air box and installed a Twin Air Power Flow kit. I've done the Applied Racing vent re-route. When it goes back together it will have an FMF Power Bomb mated to a White Brothers E2 exhaust. Setting thoughts? Any other recommendations for best performance?
    06' CRF 250x: Scotts w/BRP/Pastrana's, Fastway F3. JD Jet/Surge (165 M, 42 P, 50 L, Red 5th), 5:10 Case Saver, AR Vent, Twin Air, FMF Power Bomb, WB E2, Devol Eng. Suspension, WC Guards, Athena 280, KW valves and springs, 14/51 gear
  • Halen
    Posts:362
    Joined:Sat May 13, 2006 4:32 pm

    by Halen » Wed Feb 28, 2007 9:44 pm

    I would try the 162 main jet (you could get away with a 165) and a minimum 42 pilot. Red needle fifth position.
    I have a similar setup, a 45-165 and she is running just fine. I bet you can hardly wait to cut loose with her... eh?
    Halen
    09 CRF 250R
    RMR lowered suspension
    Heavily armoured for the bush
    50 tooth rear
    soft gel seat
  • Andy Duffus
    Posts:76
    Joined:Wed Oct 11, 2006 5:57 am

    by Andy Duffus » Wed Feb 28, 2007 9:47 pm

    That's for sure. How far north of Seattle are you? We should think about a CRF's north country ride like the Cali boys do.
    06' CRF 250x: Scotts w/BRP/Pastrana's, Fastway F3. JD Jet/Surge (165 M, 42 P, 50 L, Red 5th), 5:10 Case Saver, AR Vent, Twin Air, FMF Power Bomb, WB E2, Devol Eng. Suspension, WC Guards, Athena 280, KW valves and springs, 14/51 gear
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    KevinM
    Posts:474
    Joined:Tue Mar 14, 2006 12:21 pm

    by KevinM » Thu Mar 01, 2007 6:07 am

    here's what worked for me.. see below.
    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
  • Halen
    Posts:362
    Joined:Sat May 13, 2006 4:32 pm

    by Halen » Thu Mar 01, 2007 7:44 am

    Duffas... I am 68 blocks north of the US border (about 3 hrs from Seattle) with wide open spaces, tonnes (tons) of single track, and countryside that you can only see up here... and in Seattle :shock:
    I would be in...
    Halen
    09 CRF 250R
    RMR lowered suspension
    Heavily armoured for the bush
    50 tooth rear
    soft gel seat
  • Asmith
    Posts:14381
    Joined:Mon Apr 10, 2006 7:52 am

    by Asmith » Thu Mar 01, 2007 7:52 am

    Halen wrote:Duffas... I am 68 blocks north of the US border (about 3 hrs from Seattle) with wide open spaces, tonnes (tons) of single track, and countryside that you can only see up here... and in Seattle :shock:
    I would be in...
    Halen


    Thanks for the translation... :lol:
  • Andy Duffus
    Posts:76
    Joined:Wed Oct 11, 2006 5:57 am

    by Andy Duffus » Thu Mar 01, 2007 1:58 pm

    Halen, Sounds good maybe we should put something together North of the Border.
    06' CRF 250x: Scotts w/BRP/Pastrana's, Fastway F3. JD Jet/Surge (165 M, 42 P, 50 L, Red 5th), 5:10 Case Saver, AR Vent, Twin Air, FMF Power Bomb, WB E2, Devol Eng. Suspension, WC Guards, Athena 280, KW valves and springs, 14/51 gear
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