Ni inzira ya gari ya moshi itayobora hamwe na crankshaft, itungurwa gato ninziga ya eccentricique, aho moteri ya moteri igenda kandi isahani yo kugaburira iranyeganyega gato kugirango ibikoresho bitere imbere vuba, kugirango ibikoresho bidahinduka byoroshye kandi bimenetse .