The Reds, who are undefeated in six games, had too much class for the men in green.
Hekari slotted in two quick goals through wing Papalau Awele and skipper Koriak Upaiga for an early advantage, before Gigira pulled one back through a spot kick by captain Ian Yanum, which saw them go into half time 2-1 down.
In the second half, Gigira’s men put in a more purposeful 45 minutes, especially in the opening quarter of the half. But Hekari’s superior stamina ensured they stayed ahead of their opponents, eventually breaching the Gigira goal twice before Moses Asirib scored a consolation goal in the 79th minute.
USA-based Wira Wama made a surprise appearance for Hekari, scoring the Reds’ third goal.
Gigira Laitepo United coach David Passam admitted that his side did not do enough to stay in the contest despite producing some good plays.
Passam also praised goalkeeper Paul Peter.
Hekari stand-in coach Matthew Witu was a happy man post-match, singling out Upaiga for an outstanding 90 minutes.