if you are talking about the cover on the right side of the engine (brake lever side) then yes there is a gasket in there and the two missing screws would cause the leak. get your self a new gasket and some new screws, pull the kicker off, drain the engine oil and the antifreeze, remove all of the screws and pull the cover off, replace the gasket and reinstall in oposite order. you might have to take the foot peg and the brake lever off to get the cover off, but I can't remember.
good luck and let me know if you need anymore help.