Sinnis: Terrain T125 ZS125-86(T125). Code: 63/28 X2H. Zongshen: ZS125-39. Taro: TR125-3. Mutt: Stravaig 125cc STRAVAIG. Mitt: MITT 125 GP 2 MITT125GP2. The engine bearing in a motorcycle is a critical component that supports and allows the smooth rotation of the engine's moving parts, such as the crankshaft and camshaft.