Prechamber assembly for an engine

A prechamber assembly for an engine, the prechamber assembly comprising:

• an air-fuel chamber;
• and
• a prechamber in fluid communication with the air-fuel chamber via a conduit, the conduit comprising:
• a first end disposed in the air-fuel chamber, and
• a second end disposed in the prechamber to allow premixed air-fuel mixture to flow from the air-fuel chamber to the prechamber, wherein the prechamber is configured to receive a lean air-fuel mixture during a compression stroke of the engine;
• and
• a valve disposed at the first end of the conduit, the valve configured to allow flow of the premixed air-fuel mixture from the air-fuel chamber to the prechamber during an intake stroke of the engine, the intake stroke being prior to the compression stroke during operation of the engine, wherein the premixed air-fuel mixture entering the prechamber mixes with the lean air-fuel mixture to form a stoichiometric ratio of a rich air-fuel mixture.