bike sometimes stalls when going wide open

6 replies to this topic
  • 02yzrider

Posted April 07, 2007 - 06:16 PM


I am new to the forum and would appreciate any help I can get. I have a 2002 yz426f. Recently, I was riding and at low rpms when I try to go wide open fairly quickly the bike stalls or almost stalls out. What is the problem? Is it anything to worry about?

  • YamahaYZ426F

Posted April 07, 2007 - 06:27 PM


Its called boging when and its happens to me once in a while its happened today but i was running rich becuase i rode my bike after i cleaned the air filter bad idea :worthy: but its nothing really big to worry about and i know of a couple ways to stop it frome bogging u can put a boysen quickshot accelerator pump cover i heard that helps and also there is a free mod u can do ur self to make it quiet bogging but i forget what it is if u really whant to know what it is called i could look it up for u real quick just pm if u whant to know more hoped i helped and good luck :ride: :thumbsup:

  • buzzgrizz

Posted April 07, 2007 - 06:55 PM


Had the same problem with my KTM the other day. I changed the plug but I really think I got some bad gas. No problems since I changed plug and gas.

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  • rexbond007

Posted April 07, 2007 - 09:11 PM


ambient Temperture is warmer, lean out your jets, your main jet is too rich

  • 02yzrider

Posted April 08, 2007 - 10:27 AM


Ok. thanks for all the info.

  • TexN343

Posted April 08, 2007 - 05:23 PM


sounds like a lean stall to me. Not enough fuel delivered fast enough by the AP squirt so it dies. I have heard wiring the AP helps. If it were to bog you would hear a "whooa whooa" noise first. If it's a lean stall it just dies when you blip the throttle W.O. try rolling on the throttle. I find the lean stall happens when the rear wheel has little traction. I have done this many times in mud trying to roost the guy behind me.

  • CaptainKnobby

Posted April 08, 2007 - 06:02 PM


I had tahat problem on my 06 450f>>> went up to a 48 pilot stayed with my 165 main and put the clip on the jet needle in the #4 position!!!!! That cured the bog

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