Cream sugar and margarine until smooth; add beaten egg yolks and mix well. Combine 2 cups flour with baking powder; add to creamed mixture. Beat until smooth; add lemon extract. Coat pecans, pineapple and cherries with remaining 2 cups flour; add to creamed mixture. Fold in beaten egg whites. Cover and let stand overnight. To bake, pour mixture into greased (10 inch) tube pan and bake at 160ºC or 1- half hours. ----