Posts: 2
Joined: 5/14/2018
Location: Munising, MI USA
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
Posts: 3623
Joined: 4/3/2013
Location: Benton, LA USA
Low compression?
Fuel starvation?
Dirty pet cock screen?
Float height too low in carb?
Have you OHM tested the coil?
Paw Paw
Posts: 2
Joined: 5/14/2018
Location: Munising, MI USA
Posts: 9415
Joined: 7/6/2015
Location: So Cal, CA USA
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?
2017 RMZ450
2005 YZ250-sold :,(
1998 YZ250
2005 KX250F
80% of the time it works every time
IG @2HRacing
Thanks to : Factory Effex, N2Dirt, Acerbis, DT1, Fasthouse, Matix, FMF, ASV, 100% & Mika Metals
Posts: 416
Joined: 1/29/2018
Location: Bethania, NC USA
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....
Posts: 3623
Joined: 4/3/2013
Location: Benton, LA USA
Posts: 612
Joined: 4/1/2008
Location: Kamloops, CAN
Spark plug cap has resistor that should measure 4700 ohms, I've had one open circuit causing this exact problem.
Posts: 703
Joined: 11/9/2014
Location: Costa Mesa, CA USA
Maybe your elbow is hitting your ribs when you give it gas. Regrip the throttle, and should get out of limp mode.
KTM250SX YZ125 YZ85 PW80 ZX6 FZX700
Posts: 3549
Joined: 10/1/2006
Location: AZ, USA
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.
Powerband in every gear !
Posts: 954
Joined: 9/7/2012
Location: MA, USA
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.
If you're not mixing gas, you're not haulin ass.
Posts: 2470
Joined: 10/5/2017
Location: Bradenton, FL USA
Yup, my KTM 250 EXC stripped a PV gear and wouldn't rev out.
Unleaded tastes a little tangy. Supreme is kinda sour, and diesel tastes pretty good.
