In simple terms, the eddy decarboniser involves in the removal of carbon deposits from the engine, using either mechanical (physical) or chemical methods.

The procedure of mechanically cleaning out carbon deposits entails removal of the cylinder head and then, physically scraping off carbon deposits from the top of the pistons, the combustion chamber and other components (e.g. valves). Two-stroke engines of your needed frequent decarbonizing as the lubricating oil (2-T oil, in common parlance) burnt in the combustion chamber, leaving behind carbon residue.