Question about 2003 Yamaha YZ 125

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Won't start with out spraying gas in carb, won't stay running

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  • bazzz7071
    bazzz7071 May 11, 2010

    what is the background on the bike has it been sitting for some length of time or was this a problem that happened suddenly?

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Make sure your fuel lines and filter are clean,hooked up and the fuel valve is set to on.Also check your vacuum hoses,if one is off you may not get fuel until its back on.also if you find trash in the fuel line or filter there could be some in the carb that will need removing.

Posted on May 07, 2010

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My 5 hp craftsman tiller won't stay running changed gas sprayed carb new plug started it ran ok next day starts won't stay running dies fast like no fuel but can smell gas.


when it dies see if it will restart using a shot of starting spray in the air cleaner if it starts or sputters, sounds as if you have a plugged up carb you will need to dissasemble and soak in white vinegar for a few hours to un clogg (carefull with any gaskets)
if still nothing even with spray then you have a weak/defective coil or dammaged spark plug (start with plug replacement)

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Clean or change air filter. Clean, gap or change spark plug. Empty gas tank add fresh gas with Stabil. When spark plug is removed pull rope several times to blow out cylinder. Spray starter fluid in spark plug hole before replacing spark plug. Clean outside of carb so choke works freely. Spray starter fluid into carb breather hole with air filter removed and try to start. if running replace air filter and cover. If no start disassemble carb and clean. If no start replace carb.

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1 Answer

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Are you pulling the plug to check for wetness after cranking it a few times, WITHOUT using the starting fluid? Also, I would recommend using carb cleaner in place of the starting fluid. Starting fluid runs the engine VERY hot for a brief time and can possibly damage rings, valves, and aluminum parts.

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1 Answer

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When you drained the gas from the gas tank did you also take the carb apart and clean it. There should be a bowl that the fuel line from the gas tank goes to. There is a float in that bowl that has to go up and down to regulate how much gas goes into the engine. You may have a build up of varnish from old gas on the piece that the float moves up and down. Also there should be an idle jet that you screw in and out to adjust the idle. That also could be junked up.

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1 Answer

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The main jet of your carb is clogged and you need to open carb and clear the obstruction - spray carb cleaner on the bolt that holds the gas container to bottom of carb - also spray all the innards along with any tube that protrudes into the gas can.

Then using air compressor blow the sucker out and reassemble. That should do it.

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1 Answer

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Gap the plug at .030 What is most likely the main problem is whatever gas sat in the carb. Even with fresh gas there will be some old gas still in the float bowl. You may be able to drain the bowl and be OK but I have a feeling that the carb will need to come off and be disassembled and cleaned properly. You can try spraying carb cleaner (I dislike starting fluid as it is too volatile and carb cleaner does just as well in this instance) into the carb/intake. Remove the air filter, open the choke, and spray the carb cleaner in through that way if possible. You can actually keep an engine running by spraying with short bursts. Even by just spraying once you should be able to get the engine to start. If it does start but then will not stay running without spraying more into the engine then it is a carb problem.

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1 Answer

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first i would look for a vacuum leaks get it as close to idle as you can when cold and spray carb cleaner around and also check to see if the egr valve is stuck open this will act as a vacuum leak but not detect as one spraying carb cleaner around carb cleaner with change the engine speed near a vacuum leak

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1 Answer

Toro recycler mower won't stay running


take apart the carb float and clean it out, then take apart the rest of the carb and spray cleaner through it. sounds like you might have some old gas turned to jelly in your carb thats plugging it too much for the typical pressures inside the carb to **** through

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1 Answer

Trimmer won't stay running without starter fluid


drain any old gas/fuel mixture out of unit.
purchase new gas and mix with oil as recommended for your engine.
clean the air filter on the unit.
pull the spark plug and clean with carb spray and reinstall...

you also may need to remove the carb and clean any jets with carb spray... old gas can turn into a shellac'ish type goo and foul up the works...
I recommend draining all fuel after usage...

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