Maintenance & Technical > KX450F / KX250F

rebuild question

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powercrazy3:

powercrazy3:
It was also leaking from the valve cover gasket. Not a lot but some. About the same color also

don46:
was the picture right after running or had it been sitting? I don't like the looks of your oil but it doesn't really look like water either. and as I said a new set of rings may not have seated and cause alot of crankcase pressure. oddly I never had issues with the 450 only the 250f

powercrazy3:
That was after a minute or so of running.

don46:
Top off your fluids, take it out and ride it pretty hard to get the rings to seat, I think that will be the end of your problems. I had one 250f that took 3 rides before it quit blowing oil out the vent. We not talking major blowby on the rings but enough to build pressure in the crankcases and I think enough to areate the oil

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