You could turn that around to ask when it was changed from Lymburner to Limeburner. It looks like Limeburner was not used very much in Scotland. Sometimes it was used in registers to identify someone who used the Lymburner spelling. The great majority used Lymburner. I believe it came about because some official or minister wrote the name by the sound , andthe owner of the name could not write, so did not correct the spelling. You can see this in the brothers John and Matthew who arrived in Maine from Scotland where they where known as Lymburner, later being known as Limeburner and back to Lymburner. I think it is obvious they did not keep changing their name. Someone else probablydid not know the proper way to spell it. What we know today is someone's scribbling in some book, the book is still with us with the wrong spelling! When your name is Lymburner you can expect to see all kinds of spellings, I know that much.