I removed the carburetor float chambers to access the floats which will be exchanged IAW SB-914-056. My floats are " B " and they will be replaced with the newer " R " floats. I will contact the Australian Rotax distributor on Monday to arrange for the updated floats to be forwarded. I updated my engine log book for SB-914-055 Re: carburetor circlips, work which I completed in January this year.