Two-stroke engine and components thereof

A piston arrangement for an engine, comprising:

• a crankshaft located within a crank case;
• a primary piston located within a first cylinder and interconnected to said crankshaft by a first drive rod for converting reciprocating motion of said primary piston within said first cylinder driven by combustion occurring within said first cylinder into rotational motion of said crankshaft;
• and
• a pumping piston located within a second cylinder and interconnected to said crankshaft by a second drive rod for converting the rotational motion of said crankshaft into reciprocating motion of said pumping piston within said second cylinder;
• said pumping piston being located between said primary piston and the crank case and sealing said first and second cylinders from the crankcase;
• and
• the reciprocating motion of said pumping piston within said second cylinder aids in drawing fresh air or air-and-fuel mixture into the first and second cylinders for a new cycle and aids in pushing exhausted gas-charge of a previous cycle out through an exhaust port.