Pretty sure they made them like that so if a branch, stick or whatever comes up and hits it, it can rotate and deflect object instead of being rigid and breaking or bending…..most if not all your dirt bikes will have these stock already.
1984 Honda 200M ATC
1985 Honda 200X ATC
1986 Honda 200X ATC
1999 Honda 406EX....11:1, Web Cam / Hardened rockers. Ported. WB CDI. CT Racing header. WB E-Series slip on. Lonestar swinger.
2001 Honda/KTM 520 Hybrid Quad. Its like a 400EX but twice the horsepower.
2014 Artic Cat Wildcat Trail XT