Question about 2003 Yamaha YZ 250

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Low power stumble at idle to low rpm

I have a two stroke atv 200 blaster i bought it with many aftermarket parts but it had very little power from idle to mid rpm. after trying many things i noticed it had a spacer between the carb and the reed valve. I took it off and gained alot of power back but still not perfect. It still had a stumble from idle to low rpm before it caught itself and then it ran good. I rejetted the carb from 230 stock to 340 and that helped the performance but still had slight hesitation. I also tried lower and upper the needle in the carb it just made it worse or no change. I then tried a stock reed valve and it got it real close to perfect but you still have to rev the motor a little to get the take off power then it runs great does anybody have solution please respond thanks

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  • Anonymous Mar 24, 2014

    Hi, i have problem with idle drop on low rpm on my RM 125 1995 year. Please help me to solve this, its boring :D

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Try placing the reed spacer between .reed assembly & cylinder, also try an adjustable ignition stator plate, set at +4, k & n air filter, open air box.replace T.O.R.S. eliminator system w/ a cap & cable, and idle air screw install kit, also a pipe tuned for more torque(bottom -end/mid range) blasters dont have a lot of power on bottom end and the engine needs to rev to hit power band.cylinder porting,240 bigbore kits, & +4mm stroker crank assemblies are good performance options.

Posted on Feb 23, 2009

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There are many other possibilities causing these idle issues.Engine idles rough.There are few help links with solutions to troubleshoot such idle issues.
I suggest you refer the link below and follow its troubleshooting details:------Click the link below:-----Bad miss at idle? http://technoanswers.blogspot.com/2012/01/bad-miss-at-idle.html
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------------
1999 Ford F-150 Idles rough and quits when gas pedal is pressed less? http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html

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http://technoanswers.blogspot.in/2012/02/high-rpm-in-neutral-inconsistant-high.html

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http://schematicsdiagram.blogspot.in/2012/03/vehicle-stumbling-at-idle-and-shows.html

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Rough idle, staling and Erratic shifting? http://technoanswers.blogspot.in/2012/03/rough-idlestaling-and-erratic-shifting.html
-----------While stop engine idles like cylinder missing? http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html
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Please rate this a fixya

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