A Steve Schimmel double has seen Kamo book their place in Saturday's Stafford Choat football final against Tikipunga.
However, Schimmel and his teammates had to work for the 2-0 result after Onerahi brought their 'A' game on Tuesday night.
Kamo coach Nick Smith credited Onerahi for their play, particularly in the first spell.
"They [Onerahi] played very well, particularly in the first half," Smith commented. "In the first 20 minutes or so they came out fired up and had a whole string of corners. They really took the game to us at the start. Then, we slowly got into."
Smith said Kamo managed a much better second half after his side stuck to the game plan.
Tikipunga will play Kamo on Saturday in what will be the main match as knockout football finals head to Toll Stadium.
The day's play on Saturday will kick off with the Stafford Choat Plate final between Central Brown (second division) and Madhatters Green at 11am.
Next up sees the Central Brown premier team take on Bream Bay in the Stafford Choat Bowl final at 1pm.
Capping off the day's play is the Tikipunga and Kamo Cup final at 3pm.
Continuing the football finals fever at Toll on Sunday is the women's knockout finals which will be kicked off by a girls only football festival for 7- to 11-year-olds from 9-10.30am.
Following the kids' festival, the knockout Plate final between Bay Cosmos and FC Whangarei at 11am which will be followed by Kamo and Kerikeri in the Cup final at 1pm.
Capping off Sunday's football action is the Dave Trinder Memorial Game at 3pm which is between Northland United Old Boys [over-35s] and the Whangarei Aged Soccer Players at 3pm.