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Thread: 650sx WOT bog

  1. #1

    650sx WOT bog

    I have a 1987 model 650sx with a 44mm bn round body carb. I've tuned the idle and low speed circuit, but I can't get the thing to run right at WOT. I've adjusted the high speed screw all the way from 1/2 turn to 3.5 turns out and it doesn't make much of a difference. If I give it WOT it will die out totally and then sporadically kick in sometimes for a couple seconds. Any help is appreciated. Thanks
    Last edited by jake7995; 07-01-2013 at 11:29 AM.


  2. #2
    Quote Originally Posted by jake7995 View Post
    I have a 1987 model 650sx with a 44mm bn round body carb. I've tuned the idle and low speed circuit, but I can't get the thing to run right at WOT. I've adjusted the high speed screw all the way from 1/2 turn to 3.5 turns out and it doesn't make much of a difference. If I give it WOT it will die out totally and then sporadically kick in sometimes for a couple seconds. The carb is clean and no diaphragms or anything else in it look bad. Any help is appreciated. Thanks

    if its WOT bogg, ride it wide open, shut it off, see if the plugs are wet of dry, sometimes its as simple as a spark plug, but check what the plugs look like after WOT!, if its wet either to much fuel or inadequate spark, maybe check compression aswell

  3. #3

    Join Date
    Jun 2013
    Location
    ABITA SPRINGS, LA
    Posts
    5
    I have been fighting this same problem with my 650sx for a while. I called groupk and he says it is a crankcase leak. The crankcase seals need to be replaced.

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