Question about 2004 Yamaha TT-R 125 L

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My TTR 125 wouldn't start after being idle for several months. I removed the bowl and cleaned it and the jets, making sure that all of the openings were clear. When I put it back together, though, it leaks fuel (a lot!) through the bowl overflow. The floats move freely, although I can't quite figure out the mechanism that the floats use to shut off the fuel flow. Thanks in advance for your help.

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  • david_bergma Jun 29, 2009

    Thanks for the response and the great diagram. Unfortunately, as I returned to work on the bike, I dropped the tiny metal clip that connects to the bottom of the needle, and I can't seem to find it. A couple of questions: First, does the clip on the float go through the metal clip so that it contacts the float needle directly? And, second, should pressing up on the needle (as I did with the flat side of a screwdriver) shut off the fuel flow? I tried that, but fuel contrinued to leak. If so, should I unscrew the valve (part 21) from the carb and clean it? Thanks again. You've been very helpful.

  • david_bergma Jun 29, 2009

    Sorry to be a bit lame about this, but...I sprayed WD-40 through the fuel line, and it came out through the overflow needle valve. The needle itself then came out of its housing. Is there supposed to be something other than that clip that holds it in place, or should it move freely? The spring-loaded button on the lower end of the needle moves easily about 1/8" to 1/16". Is this normal? (I haven't put it back together yet because I don't have the clip, and I wanted to be sure the rest of it was fitted and operating properly. Thanks again. Oh, and how do I improve your rating to "very helpful?"

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The adjuster tang on the float (in green) rises and falls to maintain fuel level. It pushes on the float needle to stop the flow and drops to let fuel in. Did you loose the needle? If all parts are there, gently bend the tang upward to lower the gas level in the carb.

A “very helpful” rating for this answer? Thanks!

My TTR 125 wouldn't start after being idle for - e037244.gif

Posted on Jun 28, 2009

  • tombones Jun 29, 2009

    The clip should hook onto the float tang and to the needle. Yes, pressing upward should kill the flow of fuel. You shouldn't have to remove the valve seat. With the fuel line disconnected, you should be able to spray cleaner from both ends of the fuel inlet. Do you use Ethanol gas? It is very corrosive and could have pitted the valve face. Chances are that without the clip to hold the needle in place, it is going in at an angle and causing the overflow. Remove and clean the fuel line.



    If your dealer does not have the part, try the following.

    Go to the site below where you can see a parts diagram for your specific bike. You will select the actual brand, year, model, etc., once you go to the site. Part numbers and prices are also shown. You can order parts from this site. In the event no price is shown on a particular part, the part is not in stock. www.babbittsonline.com/pages/parts/viewbybrandand/parts.aspx



    The only thing left is to rate my answers as Very Helpful.

  • tombones Jun 30, 2009

    The needle is free in the valve casing. Only the clip tends to hold it in place. The 1/16 pin movement is normal. The rating change just means changing the last answer given when the first rating was done. Thanks.

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1 Answer

I have a yamaha ttr 125 it run good for a few hours then dies and wont start


i dont think you need a new carb but if you are already getting one this is fine you need to find out what jets are in it or you can get jet kits for your carb and change them yourself they come with instructions. with it running for a while just fine and then dies this sounds like you may have water in the gas or dirt in the carb bowl to check for dirt get a clean empty water botter clear one put the hose from bottom of carb in bottle and open the bleeder screw on the bottom of the carb bowl if there is dirt or water you will see it in the bottle empty the bowl then turn on the gas petcock let a bit more run through shut of petcock and close the bowl screw , if you see dirt then you should clean the carb remove and rebuild while you are doing this you can install larger jetting good luck

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1 Answer

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The idle circuit is plugged up. ALWAYS have a fire extinguisher on hand when working on carburetors.
Remove the water trap bowl at the bottom of the petcock, (gas valve). Is there any water or trash in the bowl? Drain a cup of gas from the tank. Is there any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).

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< < READ CLOSELY > >
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< < READ CLOSELY > >
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Please rate this solution. Thanks!

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6 Answers

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