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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Does a yamaha 2003 atv have four stroke engine?


Do you mix oil into the gas?? Is there a place to check the oil (a dip stick). Is there a special place to put 2 cycle oil for a self mixer?

If you don't mix the gas with oil and there is no special place to put 2 cycle oil, you have a 4 cycle engine.

If there is a place on the side to check the oil level, you have a 4 cycle engine.

Next question will be ... how do I check the transmission oil? If you have a 4 cycle engine, the engine oil is also the transmission oil ... rule of thumb.

You are showing a picture of a motorcycle and asking a question about a ATV, but not mentioning a model number. I don't think Yamaha is currently making a 2 stroke engine for their ATV's (there are several sizes - not including assorted models for sale around the world ... and I don't know where you are writing from (and please don't say).

Maybe the best thing for you to do is call the Yamaha dealer on Monday morning and tell them the model you have and ask the question 2 stroke or 4 stroke. There will be no more guessing on your part then.

Make sense?

Thanks for your question @ FixYa.com

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Please rate this a fixya

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