Muindasitiri yemotokari, anogona kushandiswa kugadzirisa mhepo yeinjini, mhepo yekabhini, uye mafuta kubvisa zvinosvibisa, kuve nechokwadi chekushanda kwakanaka uye kwakadzikama kwemotokari, uye kuve nechokwadi chehutano nekuchengetedzeka kwemutyairi nemutyairi.