Question about 2005 Yamaha XT 125 R

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Will fire and run briefly only initially, cant rev up

Will fire and run briefly only initially, then it only turns over and doesn't fire. Was sitting up a short time. cleaned carb out and does the same thing. what should I try? Starting fluid doesn't help start it either. Lately it doesn't even fire up.

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  • chiefjohns Oct 08, 2009

    tore the carb down wire through all jets, cleaned well, will now start again, but only runs on partial choke them eventually shuts down. I drove it around the house on 1/4 choke but it wouldn't go fast, push choke in and it shuts down, then doesn't want to start. seems to be a fuel problem of some kind.

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Dont use starter fluid it will ruin yur engine try squirting petrol on the inlet and see if it fires for a second get back to me then

Posted on Oct 08, 2009

  • ollie reece-jones
    ollie reece-jones Oct 09, 2009

    ok buddy strip the carb again take the float out and adjust the tab it sounds like a lack of fuel as the choke allows more fuel into engine bend the tab down on pic below only bend it a tad only a bit and try this get back to me then


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1 Answer

I've rebuilt he carb, ot it to turn over briefly then can't get to go since.


  • Is fuel getting into the cylinder?
  • Is there a good spark?

    If you got it to fire up initially, then it had enough fuel getting into the cylinder to burn.
    However, if its not getting enough 'constantly' then it wont run.
    Check that the carb is allowing enough fuel to get into the cylinder.

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Spec vin ecu specs


If it turns, then the battery is OK. Either spark plugs are not firing in proper order (wrong firing order), no power to spark plugs, or no fuel because of fuel restrictions (dirty fuel filter). Inspect the air filter to ascertain its not clogged air. If you smell gas, then you saturated the spark plugs, which is why it refuses to run.
Let it sit for half hour to let spark plugs dry. Inspect to ascertain its not dirty spark plugs, which will also prevent engine from running. After ascertaining its proper firing order, spark plugs are clean, and there's power to distributor cap, ascertain there's fuel in fuel lines by squirting half second (short squirt) of starting fluid into air filter. Close the air filter housing to trap flammable starting fluid gas. Turn engine without giving throttle. Let starting fluid be ignited by spark plugs. If it won't start, then spark plugs are not firing to ignite starting fluid gas. If it starts briefly, but won't run when you give throttle, but catches when a 2nd person squirts more starting fluid into air filter just before engine stalls, then its a fuel restriction issue or no fuel in fuel lines.

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It sure could be. But, first...by "won't turn over" you do mean it cranks at normal speed but won't start?
A simple test of the fuel pump is to stand by tank and listen as someone turns key to on. When first turned to on, your pump will activate for 2 or 3 seconds, pressurizing the fuel system, and then shut off if the engine computer doesn't get a cranking signal. Do you hear it come on? If not, then something's not turning your pump on. If you can hear it buzz on briefly, then maybe it's your filter. Another test: Spray a little starting fluid into your intake manifold (remove the big hose going into intake manifold) while someone tries starting it.If it doesn't fire and try to stay running, then it's probably an ignition problem. But if it does fire off, then you know it's a fuel problem-likely your pump or filter. good luck.

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