Maintenance & Technical > KX250 / KX125

extremely high rev sometimes???

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Nairns_Two_50K:
My 1996 kx 250 has an extremly high rev sometimes when starting from a cold. It happens mainly starting after trailering or after sitting for a period of time.  I have asked the dealer and nobody seems to know.  The bike will rev to the moon for maybe 5 seconds or so and then will fall to the high idle choke.  This is not just a high idle from choke. This is a super high rev that appears to be uncontrolable for under 10 secs.  My throttle is also not sticking. Throttle and slide are funtioning perfectly. Also the bike revs way up when running out of gas. Has anyone ever delt with this?

stevea100m:
my 03 125 and 03 250 both do this and i never really figured it out. Ive taken both carbs apart and cleaned them had the floats checked and nothin so i just make a habit of hittin the kill switch to control the rev untill it idles down

Nairns_Two_50K:

--- Quote from: stevea100m on March 26, 2011, 03:24:47 PM ---my 03 125 and 03 250 both do this and i never really figured it out. Ive taken both carbs apart and cleaned them had the floats checked and nothin so i just make a habit of hittin the kill switch to control the rev untill it idles down

--- End quote ---
  Somebody has to have an answer for us.  I do the same thing with the kill switch.  There has to be a reason for this spuratic start.  After it does it once at the beginning of the day it will most likely not do it again.  Not every time it does this but I have noticed after trailering it seems to be more prone to act out. It may just be a coincendence though.  Anybody else?

Openclass:
My 03 250 does this too, same yours when cold and coming out of the shed after a little rest (Storage).

agraebner:
First thing that comes to mind here is possible crankshaft seal leaking.  I had a bike did this till i replaced the stator side seal.  I guess it just leaked a little till it got running for a few minutes or it pulled a vacuum on the stator area.  The leak of unmetered air added to the rich condition of the choke = high idle

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