Internal combustion engine with shrouded injection valve and precombustion chamber system

An apparatus for use in a two-stroke engine including a spark plug, a fuel valve, and a cylinder defining a main combustion chamber having a central axis, the apparatus comprising:

• a precombustion device configured to be positioned on the cylinder along the central axis of the main combustion chamber, wherein the precombustion device includes:
• a secondary combustion chamber having a spherical shape;
• a sparkplug aperture configured to position an electrode of the sparkplug in fluid communication with the secondary combustion chamber;
• a fuel valve aperture configured to receive the fuel valve;
• a first passage extending from the fuel valve aperture to the secondary combustion chamber, wherein the first passage is configured to direct fuel to enter the secondary combustion chamber in a non-radial direction that does not project across the central axis within the secondary combustion chamber;
• and
• a second passage configured to extend between the secondary combustion chamber and the main combustion chamber, wherein the second passage includes a primary passage that is open at the secondary combustion chamber, and further includes secondary passages that diverge from the primary passage.