A lean burn pre-combustion chamber comprising: an external surface and an internal surface enclosing a prechamber volume; a plurality of nozzles (104, 204, 402, 504, 606, 607, 706, 707, 910) communicating between the external surface and the internal surface, comprising an induction zone and wherein each of the plurality of nozzles (104, 204, 402, 504, 606, 607, 706, 707, 910) is angled in-plane and out-of-plane with regard to a diameter of the induction zone resulting in a nozzle offset between a center of the induction zone and a central axis of each nozzle., a transition zone comprising a throat; a stabilization zone comprising a spark-gap electrode assembly, comprising: a primary electrode disposed within the prechamber volume; and one or more ground electrodes disposed within the prechamber volume and offset from the primary electrode to form one or more electrode gaps (604, 704, 905, 2108); a fuel admission valve (205, 501, 601, 701, 801, 901, 1101, 2004) comprising a flow admission valve configured to reduce fuel flow rates up to 70 %; and an attachment mechanism (301, 308, 806, 1908) configured to removably attach the lean burn pre-combustion chamber to a cylinder head (309, 808, 1911), and wherein the lean burn pre-combustion chamber further comprises a combustion ionization sensor (502, 602, 702, 802, 902, 912, 1102, 2005, 2006) proximate to a core of a compound vortex flow (1907, 3101a-b) for providing a signal used to control the amount of fuel to be admitted to the pre-combustion chamber. an external surface and an internal surface enclosing a prechamber volume; a plurality of nozzles (104, 204, 402, 504, 606, 607, 706, 707, 910) communicating between the external surface and the internal surface, comprising an induction zone and wherein each of the plurality of nozzles (104, 204, 402, 504, 606, 607, 706, 707, 910) is angled in-plane and out-of-plane with regard to a diameter of the induction zone resulting in a nozzle offset between a center of the induction zone and a central axis of each nozzle., a transition zone comprising a throat; a stabilization zone comprising a spark-gap electrode assembly, comprising: a primary electrode disposed within the prechamber volume; and one or more ground electrodes disposed within the prechamber volume and offset from the primary electrode to form one or more electrode gaps (604, 704, 905, 2108); a fuel admission valve (205, 501, 601, 701, 801, 901, 1101, 2004) comprising a flow admission valve configured to reduce fuel flow rates up to 70 %; and an attachment mechanism (301, 308, 806, 1908) configured to removably attach the lean burn pre-combustion chamber to a cylinder head (309, 808, 1911), and wherein the lean burn pre-combustion chamber further comprises a combustion ionization sensor (502, 602, 702, 802, 902, 912, 1102, 2005, 2006) proximate to a core of a compound vortex flow (1907, 3101a-b) for providing a signal used to control the amount of fuel to be admitted to the pre-combustion chamber. a primary electrode disposed within the prechamber volume; and one or more ground electrodes disposed within the prechamber volume and offset from the primary electrode to form one or more electrode gaps (604, 704, 905, 2108); a fuel admission valve (205, 501, 601, 701, 801, 901, 1101, 2004) comprising a flow admission valve configured to reduce fuel flow rates up to 70 %; and an attachment mechanism (301, 308, 806, 1908) configured to removably attach the lean burn pre-combustion chamber to a cylinder head (309, 808, 1911), and wherein the lean burn pre-combustion chamber further comprises a combustion ionization sensor (502, 602, 702, 802, 902, 912, 1102, 2005, 2006) proximate to a core of a compound vortex flow (1907, 3101a-b) for providing a signal used to control the amount of fuel to be admitted to the pre-combustion chamber.