Middle Tennessee Dirt Riders

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Carb is dirty I am assuming...

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  • May 24, 2018 9:37 AM
    Message # 6259311
    Deleted user

    Bought a new to me 2009 KTM 250xcw (66hours and cherry). Bike ran fine when I went to look at it after sitting for 7 months. Fired right up and ran just fine. I got the bike home and it starts right up but will not idle for anything. I am thinking about doing a little spring cleaning on the carb. I have a feeling starting and running the bike after it sat for so long pushed some old gunk into the carb. I should probably get another plug just in case as you can always use a backup anyway. 

    Does this sound like the proper course of action so I can ride this weekend?

    I know I need to take it to Bubba Victory for a once over but in the meantime.

    1 file
    Last modified: May 24, 2018 9:39 AM | Deleted user
  • May 24, 2018 1:53 PM
    Reply # 6259833 on 6259311

    Your pilot jet is probably plugged up. But since you will have the carburetor apart any way clean it all while you are at it.

  • May 28, 2018 3:26 AM
    Reply # 6267892 on 6259311

    pretty easy fix.  just remove the jets and use either the proper tool for cleaning the jet or u can use a piece of wire from a wire brush.  tons of videos online to view if you need guidance.  spray off with carb cleaner and should run like a top again.

  • May 29, 2018 9:40 PM
    Reply # 6272379 on 6259311
    Deleted user

    I have had the same issue with my KTM's after sitting up. Here's the guaranteed fix for a dirty carb:  Yamaha Carb Dip (or carb cleaner).  You need two bottles of it and a tub or dishpan. Mix the stuff with water as directed....yeah, I know it sounds weird, but it works, so just follow the directions.   Lay the carb in it overnight (you don't even have to dissassemble if you don't want to, although I think it helps).  If you do disassemble, lay all of the parts in the fluid, and you can even throw in any other jets, needles, etc that you want cleaned. Take everything out after 6-8 hours, shake out the excess, and let it all dry for 12-24 hours.  You will have a very clean carb.  The good part about this stuff is that it gets all up inside the venturis and channels that you can't see and can't get to.  It won't hurt the rubber and plastic stuff.  Ta-Da!  Squeaky clean carburetor.

  • May 30, 2018 12:21 AM
    Reply # 6272509 on 6259311

    Is this what you are referring to Jack?  


  • May 31, 2018 3:36 PM
    Reply # 6277181 on 6259311
    Deleted user

    Well thank you for all the advice. I cleaned the card and bought new jets. Same size jets that were in the bike. The bike will not kick but will bump start and then not idle. Kinda thinking the piston and rings are done.

  • May 31, 2018 9:20 PM
    Reply # 6278856 on 6259311

    Did it start an run before?

  • May 31, 2018 9:21 PM
    Reply # 6278857 on 6259311

    Did it start an run before?

  • May 31, 2018 11:34 PM
    Reply # 6278945 on 6259311
    Deleted user

    Not sure. The bottle that I got was all black. About 1.0 or 1.5 quart as I recall, a concentrate that was mixed with water, but I don't rememeber the proportions, maybe 2:1 or 3:1? I think I found it in stock at America's Motorsports. It's been about a year ago. At my age I can't remember fine details anymore, other than the fact that it worked like a charm...and the fact that I need to go get some more. If I do, I will try to post a pic.

    If the bike started good when you picked it up, you are probably right about a dirty carb issue, especially when you mentioned that it had been sitting up for a long time.  And the running-but-nor-not-idling thing screams "pilot jet"  or the pilot jet circuit.  Some of the innards of a carb just can't be accessed for physical cleaning, which is why this carb cleaner is so effective.   As my old riding buddy Webb Follin reminds me often: always look for the simplest solution FIRST.

    Last modified: May 31, 2018 11:47 PM | Deleted user
  • June 01, 2018 7:47 AM
    Reply # 6279474 on 6259311
    Deleted user


    The bike started and I did ride it around but very little as the guy I bought it from lived in a neighborhood and it had rained heavily just before I looked at it so I didn't want to shred his wet yard. To be honest the bike is in great shape and was so cheap I figured if I had to replace a few things no biggy. The fact is I am just not that skilled a mechanic as I did not get into dirt bikes until well into my 30's. 

    Thanks for the tip on the Yamaha parts cleaner. Coolsprings powersports does not have it in stock but Autozone a mile from me in Spring Hill has Berrymans Chem Dip Carb cleaner. It comes with a bucket and everything. Should I try this?

    Thank you in advance,


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