No top end power

[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

[Roostmad1]

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...

50:1?,i see you plan on your motor not lasting out the year,thats bugger all oil mate,do yourself a favour and run your KX at 32-30:1

[don46]

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...

50:1?,i see you plan on your motor not lasting out the year,thats bugger all oil mate,do yourself a favour and run your KX at 32-30:1

Are you serious, I have run 50:1 forever, never had an issue. not sure what your using for oil, maybe you should try something different.

[Roostmad1]

no are you serious!!,you must have a jetting problem if you think you can get it to run cleaner by running bugger all oil in your mix,so you know better than the factory do you!!more oil means more power,longerlasting engine period !!,i even had my jetted spot on KX250 running clean as on 25:1!!i'd rather have more oil than not enough and 50;1 is nowhere near enough lubrication!!

[ktmdude]

It is almost a 10 year old bike and has been at 50:1 from day one. It has had one top end and no real problems to speak of. I am sure it is time for a top end, I bought it a year ago and figured it needed one, but it ran strong so I let it go. I have put maybe 30 hrs on it. It was running good when I put it away, now it seems flat on the top. It could be a clogged main jet from a bit of gas that didn't make it out when I drained it for all I know. I don't think that 50:1 with good synthetic oil is bad. My 09 ktm 300 xc manual recommended 60:1, it runs great. Re-ringed it at 45 hrs, cleaned the power valve and slapped her back together, it all looked good and every thing was in spec. I think that 32:1 is a bit conservative from the factory, but to each there own. I ride mostly single track woods, if I were going to ride open desert I would want more oil for higher rpms.

P.s. I'm not sure what you mean by "running bugger all oil in your mix"?
      Not tryn to be a smart arse, just scratching my head with that one. Please explain.

[myklskc]

Check the power valve.

[blueoval]

KTM dude, won't go into the oil mixture, but it's ran well for 10 years on 50:1.  Maybe 32:1 when running the thing WFO like a professional motocross racer for 40 min at a time is necessary.  Did you clean the carb completely and be sure nothing is plugging the main jet?  Easy to check the compression also.  Just a thought.   B.O.