Maintenance & Technical > KX250 / KX125

kx 250 bottom end vs. kx125 bottom end??

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meangene34:
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??

gowen:
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.

meangene34:
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!

KXcam22:
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.

meangene34:
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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