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Author Topic: kx 250 bottom end vs. kx125 bottom end??  (Read 3341 times)

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Offline meangene34

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kx 250 bottom end vs. kx125 bottom end??
« on: March 24, 2009, 01:30:50 AM »
Ihave a question and maybe its a goofball question but i figured if it could be answered someone here could do it. I currently own a kx 250 and it is a beast it is starting to get some water in the bottom end oil where would i start looking to correct this problem i just rebuilt the top end with new gaskets. also i have the opportunity to pick up a 125 kx with a bad top end for $100 are the bottom ends of a 250 and a 125 the same??
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Offline gowen

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Re: kx 250 bottom end vs. kx125 bottom end??
« Reply #1 on: March 24, 2009, 01:35:54 AM »
No. If there is water in the oil, replace the waterpump seals. It's a 15$ fix unless there are issues (holes?) with the lower end. There is a very large difference between the cases/gears/crankshaft.
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Offline meangene34

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Re: kx 250 bottom end vs. kx125 bottom end??
« Reply #2 on: March 26, 2009, 02:44:08 PM »
thank you i am not sure if it is water in the bottom end or not i change the bottom end oil frequently and it always comes out like a dark grey color so i thought it may be getting water in the oil i figured it may be the water pump seals but if they were bad wouldn't i also get oil in the antifreeze?? also the bike seems to be noisy when running but from my experiance and anyone else i know who has ever had or riden a kx this seems to be normal. Bike runs real strong my brother has a ktm 440 2 stroke and he says that my bike seems alot more powerful although his blows mine clear away once he gets it wound up. all and all i am very impressed with the power and reliability of the kx 250 it should say " bike will always satisfy" somewhere on it cause it is a blast and has yet to disappoint!
« Last Edit: March 26, 2009, 02:47:37 PM by meangene34 »
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Offline KXcam22

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Re: kx 250 bottom end vs. kx125 bottom end??
« Reply #3 on: March 26, 2009, 03:31:14 PM »
Meangene,
  As a rule of thumb, dark grey is aluminum clutch plate particles (normal) and white-milky is water leakage from the waterpump seal (not normal). Hope this helps. Cam.
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Offline meangene34

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Re: kx 250 bottom end vs. kx125 bottom end??
« Reply #4 on: March 27, 2009, 01:14:41 PM »
yes this is a big help cause i thought it may be getting the water with the smokey color but you just took a big load off my mind. also i need a new back rotor and pads what is a good price for them and the best place to get them any help there would be appreciated.
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Offline ed_xr8

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Re: kx 250 bottom end vs. kx125 bottom end??
« Reply #5 on: June 13, 2009, 10:27:25 PM »
no the bottom ends are totaly differnt
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Offline Hillclimb#42

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Re: kx 250 bottom end vs. kx125 bottom end??
« Reply #6 on: June 14, 2009, 12:58:14 AM »
I have a rotor for an 03. (4-bolt) Moose brand OEM replacement (stock appearance), What year of 250 do you have? It won't work on my 96, I'd be happy to make you a sweet deal on it.
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