As I understand it, you cannot overfill the radiator on the Lance Duke Touring 250 via the pressure cap under the seat (it should be completely full), but you should endeavor to get a proper amount into the overflow tank next to the gas tank, however I cannot actually see what the proper amount is in that tank due to the opaqueness of the plastic. I inadvertently overfilled it and then sucked ~ half back out with a turkey baster.
With respect to the actual radiator, rumor has it that it is very important to get all of the air pockets out of the tank, and that appears to be most commonly done by idling the engine with the pressure cap off until the fan comes on, shutting off the engine, and topping off the tank, repeating this cycle until no more topping off is needed. Other folks have also suggested squeezing the upper radiator hose, but I would imagine that may require removing stuff to get good access to the hose (perhaps panels, seat).
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