On the Pilot site, there is only one Ballymoney Registered Adam Boyd - born 1820 died 1902. He was still alive, aged 80, in 1901 Census, so this has to be him.
Name: Adam Boyd
Registration District: Ballymoney
Event Type: DEATHS
Registration Quarter and Year: Jan - Mar 1902
Estimated Birth Year: 1820
Age (at Death): 82
Mother's Maiden Name:
Film Number: 101601
Volume Number: 1
Page Number: 97
Digital Folder Number: 4201705
Image Number: 00521
Collection: Ireland, Civil Registration Indexes, 1845-1958