Question about 2003 Yamaha YZ 125

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I dont know if it is a problem, but on a 2009 TT_R125EY Yamaha, the engine runs uneven at slow speeds, almost like misfiring, and seems fine at higher engine RPM. The bike is new with maybe 10 hours on it, and has always been like this.

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Uneven running can be the carb settings, possible too lean( is it better or worst with the choke on?)
If its new, let your dealer know, it is a warranty problem.

Posted on Jun 03, 2010

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Hi, Shall582 and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Vacuum line from the petcock to intake manifold cracked.
5. Float needle and seat sticking.
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9. Air/fuel mixture screw set too lean.
10. Idle port, transfer ports, slow air jet clogged.
11. Slow fuel jet clogged.
12. Faulty fuel pump.
For more information about your issue and valuable "Free" downloads that you will need please Click on the blue links below. Good luck and have a wonderful day.
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http://tjsconcepts.com/ttr225/TTR225_Service_Manual.pdf
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2008 TTR 50 yamaha will only start when starting fluid is sprayed in carb ...and won't stay running. I have dumped the old gas and changed it. Gas is getting to the Carb from the fuel tank. Can you...


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2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Vacuum line from the petcock to intake manifold cracked.
5. Float needle and seat sticking.
6. Float level too low.
7. Carburetor bowl vent line clogged/blocked/pinched.
8. Idle adjusting screw set too low.
9. Air/fuel mixture screw set too lean.
10. Idle port, transfer ports, slow air jet clogged.
11. Slow fuel jet clogged.
12. Faulty fuel pump.
For more information about your issue and valuable "Free" downloads that you will need please Click on the blue links below. Good luck and have a wonderful day.
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Walt
goalhawk@hotmail.com

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1 Answer

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