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Thread: Need help, WR450 running rough and backfiring

  1. #1
    Join Date
    Oct 2007
    Posts
    71

    Default Need help, WR450 running rough and backfiring

    I have a WR450 2006 and just finished converting it to supermoto for the street. It is running rough and back firing. Does having the stator modified from Baja designs effect how it runs or does the carb need adjusting. Can anybody help diagnosis this problem before I have to fork over cash to the dealer.
    [SIGPIC][/SIGPIC]

  2. #2
    Join Date
    Jan 2008
    Location
    gettysburg pa
    Posts
    632

    Default

    I know the jetting and accel pump were completely wrong , on my 07 . my accel pump did nothing . I think it's kind of wierd if you read the forums , everybody put in fatter jets , but mine I tested on a dyno and it was way fat , and then lean when I cracked on it . I rejetted mine and put on a rdpower bowl . I think the dyno run was money very well spent.
    so get a jet kit plus an adjustable leak jet and take it to a dyno

  3. #3
    Join Date
    Apr 2007
    Posts
    41

    Default

    If it was going good before the stator change then id blame the stator.

  4. #4
    Join Date
    Jan 2008
    Location
    gettysburg pa
    Posts
    632

    Default

    Quote Originally Posted by poly View Post
    If it was going good before the stator change then id blame the stator.
    I don't see how that stator mod would make it run bad , unless he wired it wrong or did not get good contact at the crimp. I have the same mod in mine . it works fine . Mine backfired and ran like crap on the road until I rejetted it. you use a differant throttle position on the road . wot all the time .

  5. #5
    Join Date
    Aug 2006
    Location
    Western New York
    Posts
    187

    Default

    I put a flywheel back on a 250f once and it was not locked into the keyway. It ran just like you described. I didn't even notice it at first but figured it out because the nut didn't look right.

  6. #6
    Join Date
    Jan 2008
    Location
    Cary, NC
    Posts
    140

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    Did the bike sit for any long period of time? May be as simple and a clogged pilot. Depending on what you have for fuel in your area, the pump gas around here will start to break down in about 2 weeks.

  7. #7
    Join Date
    Apr 2007
    Location
    Thornton, CO
    Posts
    781

    Default

    its all jetting or fuel delivery buddy.
    im guessing your lean. or like someone mentioned has some issues from having it sit for a while causing some crap to build in the carb. carbs/rejetting arent hard and you should be able to do it without having to take your ride to the shop. pull your carb off, remove the float bowl and smell the inside first off. wierd smell = bad gass = plugged up. take out jets (be careful as most carb parts are brass i.e. soft) and soak them in carb cleaner and blow some air through them. DONT stick wires etc. through holes. let me know what you find.
    pics would be sweet
    2010 Husqvarna SM 510 R 1982 Husqvarna WR 250 (Plan to make it an "SM" 250 )
    "Hus-Qvarna. Noun- deadly piece of machinery used to slaugther other motorcycles. Also used as verb in some cases- To kick ass and take names"-J.R.

  8. #8
    Join Date
    Oct 2007
    Posts
    71

    Default

    You are right. I cleaned the jets and also installed a easily adjustable fuel mixture screw. It is running good now.
    [SIGPIC][/SIGPIC]

  9. #9
    Join Date
    Aug 2006
    Location
    New York
    Posts
    1,245

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    Quote Originally Posted by cos450 View Post
    You are right. I cleaned the jets and also installed a easily adjustable fuel mixture screw. It is running good now.
    Thats good to hear, Im about to clean my carb
    Slowly.....Healing.....
    08 Huskey 510 SMR
    CBR600RR (SOLD)
    2003 Wr450f (SOLD)
    2004 kx125

  10. #10
    Join Date
    Apr 2007
    Location
    Thornton, CO
    Posts
    781

    Default

    Quote Originally Posted by cos450 View Post
    You are right. I cleaned the jets and also installed a easily adjustable fuel mixture screw. It is running good now.
    Awesome!
    2010 Husqvarna SM 510 R 1982 Husqvarna WR 250 (Plan to make it an "SM" 250 )
    "Hus-Qvarna. Noun- deadly piece of machinery used to slaugther other motorcycles. Also used as verb in some cases- To kick ass and take names"-J.R.

  11. #11
    Join Date
    Apr 2007
    Location
    Thornton, CO
    Posts
    781

    Default

    Are you also from colorado or is that just a passing through pic?
    2010 Husqvarna SM 510 R 1982 Husqvarna WR 250 (Plan to make it an "SM" 250 )
    "Hus-Qvarna. Noun- deadly piece of machinery used to slaugther other motorcycles. Also used as verb in some cases- To kick ass and take names"-J.R.

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