The service started with Reverend Tom Poata addressing the crowd in te reo.
Mr Mohi, who was awarded an MBE in 1994, started the Mokoia Taiaha Wananga, the longest-running mau taiaha wananga in the country, which saw more than 20,000 people attend courses.
Actor Cliff Curtis speaking at Mita Mohi's tangihana
He has also served on marae committees, school trust boards, the Parole Board and as kaumatua for the police.
Mr Mohi was also a former New Zealand rugby league player, representing the Kiwis in 1972 on a tour to France.
Following his death, second cousin and friend Trevor Maxwell described Mr Mohi as a "beautiful man" who gave so much and saved so many.