A: You may have installed the incorrect Diaphragm Repair Kit and your Toilet may require a higher GPF (Gallons per Flush). The diaphragm GPF needs to match with the GPF of the porcelain to function properly.
You can determine the gallons per flush of your valve in a couple different ways. If it is a newer valve it will have a white sticker on the underside of the valve body by the tailpiece, the sticker will have the GPF written on it. If there is not a white sticker on the valve then you can look on your porcelain fixture to see if there is a GPF stamped there, this is typically located where the brand name is.
Here is a link to the Diaphragm Kits for your Sloan Royal Flushometer:
http://www.sloanplumbingparts.com/royal-flushometer-toilet-repair-kits
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