Internal combustion engine with reduced oil maintenance

An internal combustion engine comprising:

• an engine block comprising:
• a cylinder block defining a cylinder bore;
• a crankcase defining a crankcase chamber with a crankshaft positioned within the crankcase chamber;
• and
• a cylinder sleeve fabricated from a self-lubricating plastic material;
• a piston coupled to the crankshaft and slidably arranged within the cylinder sleeve;
• a valve train comprising:
• a camshaft configured to be driven by the crankshaft;
• a first pushrod and a second pushrod, each pushrod configured to be actuated by the camshaft;
• a first rocker arm positioned configured to be actuated by the first pushrod;
• a second rocker arm positioned configured to be actuated by the second pushrod;
• an intake valve movable by the second rocker arm between an intake open position and an intake closed position to allow an air/fuel mixture to enter the combustion chamber;
• and
• an exhaust valve movable by the first rocker arm between an exhaust open position and an exhaust closed position to vent exhaust gases from the combustion chamber;
• and
• a cylinder head coupled to the cylinder block to form a combustion chamber, wherein the piston further comprises:
• a piston top adjacent the combustion chamber;
• a piston body including a wrist pin hole configured to receive a wrist pin;
• a first piston ring positioned on the piston body;
• and
• a non-metallic gasket positioned on the piston body closer to the combustion chamber than the first piston ring and structured to prevent combustion gases from escaping the combustion chamber;
• wherein the crankcase chamber is oilless, and wherein the first rocker arm, the second rocker arm, the exhaust valve, and the intake valve, each include at least a layer of a low friction material to provide oilless operation.