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If you are riding a dirt bike you probably have a leaking water pump seal allowing transmission oil into the antifreeze. If the motorcycle is a four stroke street bike the leak is probably in the head gasket.
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Flush coolant system again. Do you have a brown sludge in the oil. Do this get Preston coolant flush, drain radiator drain coolant tank, fill radiator with water, add the Preston run vehicle for about 15 min remove lower radiator hose from radiator. This will allow all residue to be removed from engine. Replace radiator hose. Fill radiator with appropriate amount of coolant. Disconnect tank from system and let water run through tank until it is clear. Reconnect tank and you should be good. Unless you have oil and coolant mixed which means a blown head gasket or cracked block
If the radiator has tranny fluid mixed in with the coolant, then you have an internal tranny cooler leak. At the one side of the tranny, in the saddle tank, there is a tube. This tube allows hot tranny fluid to enter the rad and be cooled before returning to the transmission. It should be totally isolated and submerged in the coolant tank. Occasionally they can leak, and the two fluids will mix. You will need a new rad to repair the problem. It would also be recommended to have the tranny fluid and the coolant flushed after wards. Oil of any kind does not mix well with coolant, and could cause future damage to the trannymore so than the engine.
drain the radiator refill with water & use some radiator cleaner, you may need to repeat this several times to get all the oil out......hope this helps.....cheers
if it is an automatic the auto fluid tank in the bottom tank of the radiator may have split letting the trans oil mix with the radiator coolant.
Check that first
could becoming from ur oil cooler lines that go into rad,,,could have internal crack in rad,,,pull dip stick out & ck to see if motor oil is low or a grayish color,,if ok ck trans fluid to see if is low,,have to find out what kind of oil residua is in the over flow jug
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