Musa Ceesay scored the game’s only goal for the Jarrangers side during a match played at the Soma Mini Stadium.
The Lower River Region based team, who have been searching for a win in their last five games have now recorded their sixth victory of the season.
Jam City FC, who won only one match in their last five outings have now suffered their seventh loss of the league.
The result put Jarra West on 14th position with 31 points, while Jam City sit 6th position with 47 points.
