John, Toilets are a mystery at times, but it sounds to me like the "flap" isn't staying "up" long enough to generate a good siphon. With the top tank open, adjust the chain length between the handle arm and flapper by shortening it until the flapper stays up after you depress the handle. There is a "touch" to the adjustment and you may have to do this three or four times till it is just right. Good Luck! Backyard Farmer
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18 years ago