Question about 2006 KTM 125 SX

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06 ktm 50 pro senior bogs after warming up

My son has a 06 ktm 50 pro senior.The problem is after he rides it, even after jus a few minutes, when he comes to a complete stop or coming out of a turn the bike hesitates/bogs until the power band kicks in. But after shutting the bike off and let it cool down it does fine the first take off. I have replaced the stator, ignition coil and cap, spark plug, new top end, replace the crank case gasket, new clutch, new exhaust, new carb. The whole engine is practically brand new. i have taken it to 2 seperate shops. The 1st shop i took it too is puzzled and the 2nd shop is looking into what could be causing it but i havent heard anything back from them. My son does race and need this problem solved so im hoping someone out there has come across this problem before and can help me fix this problem...thank you

Posted by azktmpapa on

  • 5 more comments 
  • metinic May 16, 2009

    my son has a junior 04 same problem would like help too

  • Eric Simonetti
    Eric Simonetti Sep 24, 2012

    my sons 05 junior 50 has same problem!

  • damo Dec 31, 2013

    It sounds like its running to rich off the bottom.

  • damo Dec 31, 2013

    It sounds like its running to rich off the bottom.

  • damo Dec 31, 2013

    It sounds like its running to rich off the bottom.

  • damo Dec 31, 2013

    because its running rich he continues to open the trottle to try and clear the probelm as it comes on .The more he opens the trottle the more fuel is getting sucked in to the engine. Then as the bike changes from the pilot jet to the main jet as it clears its troat and takes off . Check your jetting , the clutch can also be a problem on these bikes , it gives the impression of poor tuning but really its the clutch engaging to early and bogging the bike down , like taking off in to higher gear on a normal geared bike. hope this helps.

  • james summers
    james summers Jan 16, 2014

    my son has 2001 sx starts fine but wont tic over and after he rides it for a bit turn it off and wont start for about half an hour eny sugestions

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Eric Simonetti

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I thought about it and: If it runs good cold, then the bog shows up as it warms up then the engine is running rich in the mid-range. You dont notice it when cold because engines like it rich when they're cold, hence the choke. I'm going to try lowering the needle(RAISE THE CLIP A NOTCH) on the slide in the carb. This should lean it out some in the midrange and cure the bog. I'll let y'all know what happens.

Posted on Sep 27, 2012

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  • Eric Simonetti
    Eric Simonetti Sep 27, 2012

    Doesn't have an accelerator pump.

  • Eric Simonetti
    Eric Simonetti Sep 27, 2012

    The needle adjustment didn't seem to help, I'm starting to think it may be clutch related. Maybe the clutch grabs sooner/harder as it gets warm?

  • Nick Fox Dec 02, 2012

    My sons 05 senior 50 is having an issue where it bogs out and dies when he tries to take off if the choke isn't on. Any help would be greatly appreciated this is my first dealing with any 50 peroid.

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It sounds like he is running out of fuel in the bowl,poss accelarator pump ?

Posted on Apr 02, 2009

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06 ktm 50 jr, runs good cold, but heats up quick. When hot its not as responsive, bogging on bottom end, sounds bad. Clears up in mid to top. Piston, rings, cyl, water pump all look fine and appear to be...


Thank you for contacting FixYa with your inquiry.
Sounds like you have a low coolant, restricted flow, or a water pump issue.

Make sure the coolant is present when cold and up to the top fill level. If not fill with 50% antifreeze and water solution.
Go to this link and drill down to info below. Check out the visual of the radiator parts. http://cyclehuttktm.com/FicheFinderNew/FicheFinder.aspx 2005 > 50 SX PRO JUNIOR LC > ENGINE > COOLING SYSTEM
Inspect the radiator fins and make sure there is not any obstructions preventing air flow. Inspect all the fittings to make sure no dents or restrictions exist. Twists or kinks in hoses. Tighten all hose clamps to ensure no coolant is leaking. Drain the transmission fluid and refill it to the proper level (Low oil would increase low rpm friction)

Go to this link and drill down to the case parts: http://cyclehuttktm.com/FicheFinderNew/FicheFinder.aspx 2005 > 50 SX PRO JUNIOR LC > ENGINE > ENGINE CASE
Disassemble the water pump from the left side case and inspect the impeller and drive parts.
If you have the owners manual look under the problem solver section for overheating for pictorials.
Let us know if we can provide further assistance.
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Thank you for contacting FixYa with your issue.
Usually when it comes to excessive fueling or gas overflow we should start by looking at the float or the needle valve turning of the fuel actuated by the tab on the float turnoff. Chances are the bike was stored over the winter and the gas shellacked up and the float or needle valve is sticking (or possibly hanging in the open position in this case) .
Remove or disassemble the carburetor and clean the the jets, the float valve, (confirm the mini spring is properly connected and attached). Check the float to make sure it's operative and nothing is bent or dented so it's hanging. Give everything a thorough cleaning and air blow with with pressure can.
If the jetting has been changed out go back to stock jetting. Check to make sure the Thumbscrew for the air jet hasn't vibrated off. Should be out about 1 1/2 turns from the home position.
Let us know if we can provide further help, and thanks again for using FixYa.
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