TOHATSU Outboard Piston

A: It is the moving component that is contained by a cylinder and is made gas-tight by piston rings. In an engine, its purpose is to transfer force from expanding gas in the cylinder to the crankshaft via a piston rod and/or connecting rod.

A: The top section of an outboard motor, or the outboard powerhead, is composed of various components that make up a combustion engine. It houses the engine block, cylinder heads, pistons and valves that make the engine run.

A: A 4-stroke outboard motor is a type of internal combustion engine that completes its power cycle in four distinct piston strokes: intake, compression, combustion (power), and exhaust. Each stroke serves a specific purpose, and the full cycle requires two crankshaft revolutions.

A: The piston is a moving part of the combustion chamber. It is responsible for converting the energy released during the combustion process into mechanical work.

A: Piston replacement intervals are typically outlined in your machine's factory service manual. Using dirt bikes as an example, many manufacturers outline a piston and ring replacement schedule of every six races or 15-30 hours for a four-stroke, depending on the machine.