2004 Yamaha YZ 125 Logo
Anonymous
Anonymous Posted on Mar 14, 2011
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2004 yamaha yz 125,All stock,wont kick start but will pull start,then it sounds flooded and gas smell is real strong.wont idle withoutkeeping motor reved.thanks forthe help......

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  • Anonymous Mar 15, 2011

    thanks,I checked for compression by taking out plug and kicking,There wasnt very much.wouldnt movemy finger off of hole.barlyfeltcompression..Need new rings??

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mxtras

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  • Posted on Mar 31, 2011
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I agree with Rotax81 - it sounds like you're down on compression. Low compression will make a 2-stroke run rich and will make any engine increasingly difficult to start. What you describe sounds like the classic tell-tale signs of a shot top end, plain and simple.

I would not mess with the carb until you confirm the condition of the top end - it would be like putting a Band-aid on a broken Femur.

Scott

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  • Posted on Mar 14, 2011
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Sounds to me like the carb needs sorting, either the float height needs setting or the needle valve is leaking. to test if it is either of them try turning the fuel off and start it, if it runs a lot better then thats your prob.
T

  • Anonymous Mar 15, 2011

    it might be the rings but it sounds a bit more serious. it might need a new piston as well and the bore might need looking at... the bore will be nicasil (or similar) plated on that bike.

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