04 yz 250 will not rev all the way out

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5/14/2018 2:13 PM

I adjusted all my jetting cleaned the carb check the power valve checked the piston cleaned the air filter new plug. From low rpm I can hold it to the bar and it’s fine but as soon as it gets on the pipe it’s like it’s in a limp mode and just spits and sputters I unplugged the tps and same thing

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5/14/2018 2:57 PM

Low compression?
Fuel starvation?
Dirty pet cock screen?
Float height too low in carb?
Have you OHM tested the coil?

Paw Paw

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5/14/2018 3:04 PM

Alright I’ll try these things could this be symptoms of bad reeds? Thank you

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5/14/2018 3:09 PM

Garret_yz250 wrote:

Alright I’ll try these things could this be symptoms of bad reeds? Thank you

Have you checked them for cracks, chips or if they are sealing properly?

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2017 RMZ450
2005 YZ250-sold :,(
1998 YZ250
2005 KX250F

80% of the time it works every time
IG @hammerfamily_4 & @2HRacing
Thanks to : Factory Effex, N2Dirt, Acerbis, DT1, Fasthouse, Matix, FMF, ASV, 100% & Mika Metals

5/14/2018 4:44 PM

Could be spark plug (even if it doesnt look bad)
Wet or worn out silencer packing

Friend had his spark plug causing his 125 not to rev out....

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5/16/2018 6:22 AM

Collapsed inner silencer screen?

Paw Paw

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5/16/2018 6:26 AM

Spark plug cap has resistor that should measure 4700 ohms, I've had one open circuit causing this exact problem.

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5/16/2018 11:49 AM

Maybe your elbow is hitting your ribs when you give it gas. Regrip the throttle, and should get out of limp mode.

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KTM250SX YZ125 YZ85 PW80 ZX6 FZX700

5/16/2018 12:06 PM

Power valve may not be opening. This is exactly the symptoms it causes. Could either be stuck with carbon buildup or a problem with the governor mechanism.

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Powerband in every gear !

5/16/2018 12:18 PM

FGR01 wrote:

Power valve may not be opening. This is exactly the symptoms it causes. Could either be stuck with carbon buildup or a problem with the governor mechanism.

Seconding this.

If the PV doesn’t open, the bike will ride normal up to the powerband, then it will go flat on it’s face.

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If you're not mixing gas, you're not haulin ass.

5/18/2018 12:02 PM

FGR01 wrote:

Power valve may not be opening. This is exactly the symptoms it causes. Could either be stuck with carbon buildup or a problem with the governor mechanism.

Yup, my KTM 250 EXC stripped a PV gear and wouldn't rev out.

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Unleaded tastes a little tangy. Supreme is kinda sour, and diesel tastes pretty good.