Larimp trailed by 10 points in the first quarter, 6-16, but swiftly found its range in the second canto to grab the driver's seat at halftime, 33-31.
Larimp maintained its strong defensive stance in the final half behind the trio of playing coach Lando Tabalin, Mark Gamallo and Ringo Balbuena to keep J & B at bay until the closing minutes of the game.
Tin Atillo and Tasy Vidal lead Larimp with 15 and 14 points, respectively, while Jerry Tindoy added 10 markers.
Keith Arellano had 30 points, while Michael Dumdum added 21 markers in a losing cause.
In an exhibition game, PPSA All-Stars clobbered visiting Rama Boys Barkada of Cebu City Vice Mayor Michael Rama, 84-73.
Erik Espinosa drilled 17 points for PPSA, while Junard Ciabo and Lito Navarrro tallied 14 and 10 points.
Lemar Alcover, Reynold Zamora and Daryl Yuvallos scored 30, 14, and 12 points for Rama Boys.
The scores
First game
PPSA (84)- Espinosa 17, J. Ciabo 14, Navarro 10, Arias 8, Lim 8, Mata 6, Bacalla 6, Petallar 6, A. Ciabo 4, Sanchez 4, Almojallas 2
Rama Boys (73) - Alcover 30, Zamora 14, Yuvallos 12, Abella 5, Rama Sy 4, M. Rama 4, Milan 2, Dela Calzada 2
Second game
Larimp (83) - Atillo 4, Laredo 4, E. Tabalin 4, Balbuena 4, L. Tabalin 3, Cavite 2, A. Gumallo 2, Co 2
J & B (76) - K. Arellano 30, Dumdum 21, Tecson 6, A. Arellano 4, Caballes 4, Solatorio 4, Abbu 2, Mier 2, Galan 2