Sinnis: Terrain T125 ZS125-86(T125). Zongshen: ZS125-39. Taro: TR125-3. Mutt: Stravaig 125cc STRAVAIG. Mitt: MITT 125 GP 2 MITT125GP2. Size: M6 x 120mm. The bolt tightening force is an important factor for the mutual sealing of combustion chamber, lubricant and coolant channels, and the ambient air.