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Does the oil look like a vanilla milk shake? If so, drain it, change the filters (katooms have two, right?) and repeat a couple times.
You might want to pour some dry cleaning solvent through the oil tank (front downtube) with the oil lines disconnected to get rid of any junk that might have collected there too.
Did the same thing to a new 1978 XL250, didn't hurt it one bit. Had to swim down to it, tie a rope to the front wheel and have a couple buddies help me pull it to the surface (don't ride in filled up strip mines).
You might want to pour some dry cleaning solvent through the oil tank (front downtube) with the oil lines disconnected to get rid of any junk that might have collected there too.
Did the same thing to a new 1978 XL250, didn't hurt it one bit. Had to swim down to it, tie a rope to the front wheel and have a couple buddies help me pull it to the surface (don't ride in filled up strip mines).