u ustempered Ductile Iron (ADI) is a nodular cast iron that has undergone an austempering process. ADI's superior mechanical properties and design flexibility have made the development of this material even more important. Although ADI is not a lightweight material, the application of the thin wall casting method allows ADI to be applied to the thin wall austempered ductie iron (TWADI) method so that it can compete with aluminum in terms of weight. The manufacture of quality TWADI must pay attention to the right temperature and holding time.The research methodology is carried out in several stages of the process, namely: pattern improvement, mold making and casting process. Polo_ is made of wood. fian The mold is made of fiuran sand. The casting process is vertical casting. Next, the austem process is carried out at the selected basic temperature, which is 960°C with a holding time of 35 minutes. Austempering temperature yak.,;,, selected? i, which is 350°C with a hold time variant of 15-60 minutes. Testing: testing of chemical composition, observing the structure of niiii-o-, (.:-1.1.11ri p igut ams ie tank test and compressive test. Results of a-Lir microstructure which is a..a.ri a ah t nodular in 100% pearlite matrix. The mechanical properties obtained are the highest tank strength of 57.1 kg/mm2 on the C1SC sample, the highest compressive strength of 78.90 kg/mm2 on the C4SC sample. The maximum stress that occurs on the Vespa PX 150 motor is 14.87 lcg/mm2 , this value is below the compressive strength of the piston rod component so it is safe to use.