Maintenance & Technical > KX250 / KX125

No top end power

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ktmdude:
So I dusted off the 01 250 on sat, put fresh gas (50:1) in. Fired up first kick. Loaded up and went to visit a buddy and ride, when we went down the fire road it seamed to have no top end. It hit power band like normal, but it seamed flat after that. I pined it and clicked gears, holding it wot. I don't ever remember doing that before. (Holding it open) It seamed plenty fast just rolling on before, I don't think my 300 is THAT much faster, so I don't think its me.

I have not ridden the bike for 5 or 6 months. I drained all the gas from the carb before I put it away. It has good oil and air filter. (1 or 2 quick rides) I don't know when it got a new top end. (got it used) I didn't change the jetting, and it has a fmf knarly and turbine core 2 with good packing (10 hrs maybe), v force 3, and 11 oz fww so it is a bottom end powered bike. But some thing was not right.

Any thoughts...

ktmdude:
Time to freshen it up?...

ktmdude:
Stuck power valve?...
Anybody?...

kaw rider:
take the cover off when running to see if the rod is moving when revingthe motor up.

Motorrad:
Don't know that bike very well nbut if it's a 2 ring bike n and one is stuck.   Could cause it. That one got me before when I was running castor 927. 

I also agree to see if kIPS is functioning.

Those woods knarley pipes really to lay down on top end. Never noticed till I rode my buddies bike. N

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