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I just bought this 2002 for my son. the seller said that the top end was changed about 7 hour. when i got the bike home it started running rough. i noticed the oil was discolored ( not milky ). i changed the oil and spark plug. bike ran fine but after about 20 minutes of riding the oil was back to being discolored ( grayish brown). any thoughts , suggestions, or fixes would be greatly apreciated.
 

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Braaaaaaaaap
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Milky would be the water pump seal went bad and the coolant went into the oil. Murky, would just be clutch particles contaminating the oil, speaking of that, mines grey, time for an oil change!
 

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Change the water pump seals. If not, you should check the water pump impeller shaft, it may need replacement. I had a 2001 with the same issue, fixed with shaft replacement. Good luck.
 
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