Question about 2001 Yamaha SR 125

5 Answers

Sr 125 91. will not start when its been running for a while. onces its cooled down it starts. running a bit fast on tick over.

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  • 6 more comments 
  • jayrats May 19, 2009

    how can you tell if the valve is fault we have tried all the other things you said

  • jayrats May 20, 2009

    sr 125 year 91. will not start when it has been running a while. will start when it has cooled down. have checked coil, carb, valves . changed pug. plug is not getting wet wiyh fuel

  • jayrats May 20, 2009

    tried all that stil ldid not like to start when hot

  • jayrats May 21, 2009

    any other ideas before we spend money on a new or second and parts. we have done all that has been suggested

  • jayrats May 21, 2009

    really not sure wot to do now. asked loads of people. most say same thing. can a exsust realy cause such a problem, causeing the bike to have running proplems. help!

  • jayrats May 26, 2009

    still no joy. someone must have a good idea.

  • jayrats May 26, 2009

    change wot? do not understand wot you mean?

  • jayrats May 28, 2009

    it is a yahama sr 125cc motorbike year 1991

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5 Answers

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  • 219 Answers

Hi,
well better would be to take it to some mechanic.

Thanks!
Sandy

Posted on May 28, 2009

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  • 108 Answers

Ok u should change the exsalater of ur bike ok rate me

Posted on May 26, 2009

  • k srinivas ganesh
    k srinivas ganesh May 26, 2009

    CAN U PROVIDE GOOD INFORMATION WHAT IS SR 125 91 POST THE RIGHT QUESTION

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  • Yamaha Master
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The most likely cause of this is the crankshat pickup under the small cover on the side of th engine, this is the common part that fails from heat and vibration

Posted on May 21, 2009

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  • Master
  • 355 Answers

Remove the water trap bowl at the bottom of the petcock, (gas valve). Any water or trash in the bowl? Drain a cup of gas from the tank. 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 two screws 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. Set the idle speed with the idle screw. This process should get you back on the road.


Since you mentioned uneven idle revs, be sure the carb and manifold are on tight and also tighten the cylinder and head. Air leaks can screw up the idle.

Posted on May 20, 2009

  • 2 more comments 
  • Rohit  Asthana
    Rohit Asthana May 20, 2009

    lean the air filter. Try a shot of either down the carb. if it fires up you can be pretty sure that fuel IS the problem. Clean the carb. Also clean the water trap bowl on the fuel valve. Bear in mind that not all models have a water trap.



    How old are the crank seals? No pressure in the crankcase means no gas
    to the cylinder. Seals generaly go bad slowly, not all of a sudden.
    Exhaust pipe collapsed internally creating back pressure or is it
    letting exhaust gasses through as it should?

  • Rohit  Asthana
    Rohit Asthana May 20, 2009

    if your going to clean the carbs anywyas. Clean them, sync them and see
    how she runs, if still doing the same thing the idle screw needs to be
    adjusted. The RPMs should be between 800 to 1200 while idling. If your
    bike is an older on it will most likely sit around the 1200 rpm at idle.

  • Rohit  Asthana
    Rohit Asthana May 20, 2009

    if your going to clean the carbs anywyas. Clean them, sync them and see
    how it runs, if still doing the same thing the idle screw needs to be
    adjusted. The RPMs should be between 800 to 1200 while idling. If your
    bike is an older on it will most likely sit around the 1200 rpm at idle.

  • Rohit  Asthana
    Rohit Asthana May 21, 2009

    Well If i have more idea regarding this issue i will let you...


    Thanks


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  • Yamaha Master
  • 19,396 Answers

I think this is a carb engine.

First replace spark plug, check air intake and filter and fuel filter, eventually replace them.

In that case the engine may be stopping when a mixture with too much fuel is getting dispensed by carb, and you need to wait for spark plug to dry before destarting. Try working on carb settings in that case.

Check also fuel pressure and compression using an hand gauge tool that can be purchased at any spares shop. If fuel pressure gets low at hot , then it may be a faulty fuel pump.

Check if problem pesists without the fuel tank cap, in that case replace cap.

Ensure that there is no fuel line blockage.

Also a faulty valve can cause similar problems.

Posted on May 19, 2009

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