Moteri ya lisansi ya piston igira uruhare runini mubikorwa bya moteri yaka imbere, ni umugongo wimodoka nyinshi muri iki gihe. Ibi bice bya silindrike bifite inshingano zo guhindura umurongo wumurongo uterwa kuva gutwika lisansi muburyo bwo kuzunguruka amaherezo imbaraga ikinyabiziga. Gusobanukirwa uburyo izo piston zikora bishobora gutanga ubushishozi bwingiriro muri perfo
