Question about 2004 Yamaha TT-R 125 LE

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My dirt bike quits running as soon as you turn off the choke

Will not start unless choke is on

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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 ).

Drain the carburetor. There should be a screw on the lower side of the carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. Install a new stock NGK spark plug and try to start the engine. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.

Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Remove the idle screw and the air screw on the outside throat of the
carb and spray into the screw holes as well.
< < READ CLOSELY > >
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Put the rest of the
carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine. This process should get you back on the road.

Please rate this solution. Thanks!

Posted on Apr 22, 2009

  • tombones May 28, 2009

    The bike will start but only with the choke. Obviously the carb is getting gas. Normally if you must use the choke, then the pilot circuit is restricted. That is why cleaning the carb is called for. Two possibilities exist. The circuit is still restricted or there is enough of an air leak in the intake to lean the fuel / air mix to the point it requires the choke to richen the mix. A new intake manifold seal may be needed. Check head bolt torque and look for head gasket leaks. Turn the pilot screw counter clockwise 1/2 turn. The screw is at the front of the carb just ahead of the float bowl.



    Be sure that start cable1 and start cable 2 are operating properly. The #2 cable connects to the intake manifold pipe. At the connection there is a plug that opens and closes. Make sure the plug is operating properly.

  • tombones Jun 13, 2009

    So what have you found out? Is the bike fixed now?

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Step 112230_65x95_aspect.jpg
Move switch to ON position
Locate your dirt bikes OFF/ON, RUN/OFF, or START Switch. Use your finger to move the switch to the RUN, ON, or START position.
  • Step 212233_65x95_aspect.jpg Turn fuel switch ONLook on the side of your dirt bike near the engine and locate the "FUEL ON/OFF" switch. Use your finger to move the lever to the "ON" position. Your dirt bike will not start if the fuel is turned off. This off switch helps prevent fuel leaks when your dirt bike is stored.
  • Step 312234_65x95_aspect.jpg Turn choke ONIf your dirt bike engine isn’t warm, you will need to turn the choke on to start the bike. Locate the choke lever near the engine on the side of your dirt bike, probably not far from the "FUEL ON/OFF" switch. Use your finger to move the choke lever to the on position. Once your dirt bike has started and the engine has warmed up, you will need to move the choke lever to the "off" position.
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  • Step 512239_65x95_aspect.jpg Push all the way downIf the bike doesn't start after the first attempt to kick start it, try again. Remember to push the peg as far down as it will go with as much of your weight as possible.
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    • If your dirt bike is equipped with an electric-starter, but won't start, you can follow these steps and kick start it.
    • Remember: always wear safety equipment when operating a dirt bike or ATV.
    • You should at least wear a helmet, boots that cover your ankles, and a chest protector to avoid serious injury.
    • Always supervise children when operating motor vehicles.
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