Question about 2004 Yamaha YZ 125

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Small pinholes in the reed valves

Engine will start but the bike will not stay running it would bogg out as if itt were getting to much fuel or not enough fuel

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  • Wendall Werrun Feb 21, 2012

    it is not the carb i have eliminated all possible problems but the reeds.. would this cause it to do this?

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  • 185 Answers

Yes mate... It is hard to say without seeing the reed valve but I guaranty a dodgy reed valve will make running and tuning the bike a nightmare. Your reeds need to seal perfectly and open and close about 2-3 times a second so if any cracks, holes or damage to them then they will never seal correctly which will allow blow back through the carbi and incorrect air and fuel mix to be sucked into the motor. best solution buy a V force reed kit it replaces the entire cage and reeds just bolts in (4 bolts) I sell them for about $160 delivered, or if your know what you are doing then you can just replace the reed petals with new... About $60 ishwww.motoxpartsonline.com

Posted on Feb 21, 2012

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Posted on Jan 02, 2017

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SOURCE: does th reed valves cause the bike not too turn on

if you mean not to start they could. a reed valve is simply a one way valve that captures the air fuel mixture in a two stroke motor forcing to go into the combustion chamber rather than back out the carb

Posted on Oct 02, 2009

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